just bought 85 K-20 6.2L diesel - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ozark Tim · 03-14-2012, 10:51 AM

Just bought this truck.
Has 139k miles on the truck.
Runs good but after it sits for 3 or 4 hours or overnight when you start it, it will start and die immediately and then you have to crank it and bleed a knob on the rectangular box on the firewall then do again a few times and it will start and run fine after the 3rd time. Leak in a fuel line?
Anyone ever dealt with this issue?
Nice truck and planning to use it on the farm but dont want to have to bleed it every time it sits for a night etc.

Squareforceone · 03-14-2012, 10:54 AM

That's a beautiful truck... and that's a realy truck not like what they put out today man.. that thing is nice

Ozark Tim · 03-14-2012, 10:56 AM

Thanks for the compliment! Just bought it to take and keep on the farm so I dont get stuck heading to the hunting spots. Probably live in the garage and come out 10-12 times a year.

**Corts60** · 03-14-2012, 11:18 AM

What rectangular box are talking about? The fuel filter? We need more info or pics on what you're talking about. What did the previous owner say about it?

Truck looks beautiful.

Ozark Tim · 03-14-2012, 11:25 AM

I think it is the filter. Mounted next to the a/c evap coil ox and has snap spring's like the way a master cylinder lid is held on. Has a clear or white cap on the top left that bleeds it.
Previous owner showed me how to make it start by bleeding it after cranking the engine and said he thought it was a leaking fuel line.
I have never owned one of these so do not know where to start.
Sorry no other pictures immediate but can take more if you think it would help.
Thanks Tim

Dieselholic92 · 03-14-2012, 11:28 AM

Well you're getting air in the system somewhere near the engine bay and the fuel is draining back to the tank. I would start looking around where you bleed it. It could even be the thing you bleed it with thats letting air back in.

Nice truck by the way!

Ozark Tim · 03-14-2012, 11:39 AM

Thanks man! Appreciate the compliment.
I will start looking for the culprit!

Dieselholic92 · 03-14-2012, 12:10 PM

You haven't noticed any puddles of fuel or anything have you? If there are no leaks then I would look for places air could get in. Either way it's losing its prime and there's a bad hose, line or connection somewhere. If it's not around that bleeder you are talking about, just check out the rest of the fuel system from the tank to the engine.

Ozark Tim · 03-14-2012, 12:23 PM

No I havent but it is on gravel so might not be evident.
I just bought it so havent had any time to study the situation yet.
Could it be from that filter box (dont know the technical term) with the bleeder to the engine, or would it be from the box with bleeder back to the tank or all of the above?
Appreciate your input!
Tim

chevymotocross · 03-14-2012, 01:04 PM

Now THAT'S a truck.

Dieselholic92 · 03-14-2012, 01:18 PM

Quote:

Originally Posted by Ozark Tim

No I havent but it is on gravel so might not be evident.
I just bought it so havent had any time to study the situation yet.
Could it be from that filter box (dont know the technical term) with the bleeder to the engine, or would it be from the box with bleeder back to the tank or all of the above?
Appreciate your input!
Tim

It could be any of the above. Most of the time on diesels, they will lose their prime between the filter and the tank, not from the filter to the engine.

Ozark Tim · 03-14-2012, 02:08 PM

Good to know!
I will have to get under and start looking.

manimal · 03-14-2012, 04:08 PM

Also check out The Diesel Place. LOTS of very good info there on the 6.2. I know I love mine. I think I have read to get rid of the 'box' type filter and go with the older screw-on filter.

manimal · 03-14-2012, 04:09 PM

BTW, that is a VERY nice truck you got.

Ozark Tim · 03-14-2012, 04:11 PM

Thanks Lance!
That isnt a bad idea at all. That box filter thingey which never having owned one of these is alien to me anyway, looks like a problem waiting to happen.

Mattman2010 · 03-14-2012, 08:24 PM

If it has dual tanks check the tank switch under the truck on the passenger side. When I first converted my truck to a 6.2 my switch was letting air in and I couldn't keep it running. Once I got the switch swapped out with another one I had laying around it starts right up.

D13 · 03-15-2012, 06:38 AM

Box filter works fine, nee to check the o rings on the screws. There's a thread on it over at DP.

Remember, keep an eye on temp and oil, check those oil cooler lines (LH rear of block).

ElGracho · 03-15-2012, 07:54 AM

Your leak is most likely out the back of the fuel filter base from the differential pressure sensor. They leaked enough that GM/Stanadyne stopped putting the sensor in that filter in about 1988 or so. Get a different housing that doesn't have the sensor.

I'm on my 4th 6.2 diesel truck and 3 of them have leaked there. The one that doesn't is an 82 and has the old round filters...

The square filter works great otherwise and is very quick and easy to change. I wouldn't get rid of it...

ElGracho · 03-15-2012, 07:56 AM

Here's a replacement switch (not mine).

http://www.ebay.com/itm/Stanadyne-Va...48f826&vxp=mtr

**special-K** · 03-15-2012, 08:15 AM

Nice truck! That's exactly what I've been looking for. I even posted my diesel '85 Jimmy for trade for a truck like that. Great find.I just can't find one around here.

Definitely air getting in there. Look for seepage.It could be anywhere...in front of or behind the filter/water separator. Does it start right up after bleeding or still crank a while? Definitely look for seepage from tank to injectors,but when an injector pump goes it will get hard to start. But,it's all the time.

Ozark Tim · 03-15-2012, 08:53 AM

Thanks all!
I will be checking all those things as soon as I have time to get on it.
All great information that I appreciate!
Tim

Eyegore · 03-15-2012, 10:59 AM

Really nice truck need more pics though

Ozark Tim · 03-15-2012, 11:06 AM

Will try to do that soon. Might take a while though b/c I am tied up with some training and have been crazy busy.

rcbildr · 03-15-2012, 08:28 PM

A problem I had was where the injector return line T's in to the hard line (right behind the alternator). The little hose coming off the injector went bad and made my burb difficult to start. The hose was an old cloth covered rubber POS. It would fire up then immediately die. Once I replaced that hose and double checked all the other connections...found a loose hose clamp too...the beast would fire right up.

Hoods69BadBowTie · 03-15-2012, 10:25 PM

Awesome looking truck looks preety clean and well taken care of. Good luck on the air issues hope it's an easy fix for ya!
Posted via Mobile Device

03-14-2012, 10:51 AM	#1
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	just bought 85 K-20 6.2L diesel Just bought this truck. Has 139k miles on the truck. Runs good but after it sits for 3 or 4 hours or overnight when you start it, it will start and die immediately and then you have to crank it and bleed a knob on the rectangular box on the firewall then do again a few times and it will start and run fine after the 3rd time. Leak in a fuel line? Anyone ever dealt with this issue? Nice truck and planning to use it on the farm but dont want to have to bleed it every time it sits for a night etc. Attached Images

03-14-2012, 10:54 AM	#2
Squareforceone Registered User Join Date: Nov 2010 Location: Rustville USA or southeast Ia Posts: 654	Re: just bought 85 K-20 6.2L diesel That's a beautiful truck... and that's a realy truck not like what they put out today man.. that thing is nice __________________ Rust is better than rice.

03-14-2012, 10:56 AM	#3
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel Thanks for the compliment! Just bought it to take and keep on the farm so I dont get stuck heading to the hunting spots. Probably live in the garage and come out 10-12 times a year.

03-14-2012, 11:18 AM	#4
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,689	Re: just bought 85 K-20 6.2L diesel What rectangular box are talking about? The fuel filter? We need more info or pics on what you're talking about. What did the previous owner say about it? Truck looks beautiful. __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725

03-14-2012, 11:25 AM	#5
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel I think it is the filter. Mounted next to the a/c evap coil ox and has snap spring's like the way a master cylinder lid is held on. Has a clear or white cap on the top left that bleeds it. Previous owner showed me how to make it start by bleeding it after cranking the engine and said he thought it was a leaking fuel line. I have never owned one of these so do not know where to start. Sorry no other pictures immediate but can take more if you think it would help. Thanks Tim

03-14-2012, 11:28 AM	#6
Dieselholic92 Registered User Join Date: Feb 2012 Location: Lynd, Minnesota Posts: 201	Re: just bought 85 K-20 6.2L diesel Well you're getting air in the system somewhere near the engine bay and the fuel is draining back to the tank. I would start looking around where you bleed it. It could even be the thing you bleed it with thats letting air back in. Nice truck by the way! __________________ Semi professional heavy equipment operator Amateur mechanic

03-14-2012, 11:39 AM	#7
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel Thanks man! Appreciate the compliment. I will start looking for the culprit!

03-14-2012, 12:10 PM	#8
Dieselholic92 Registered User Join Date: Feb 2012 Location: Lynd, Minnesota Posts: 201	Re: just bought 85 K-20 6.2L diesel You haven't noticed any puddles of fuel or anything have you? If there are no leaks then I would look for places air could get in. Either way it's losing its prime and there's a bad hose, line or connection somewhere. If it's not around that bleeder you are talking about, just check out the rest of the fuel system from the tank to the engine. __________________ Semi professional heavy equipment operator Amateur mechanic

03-14-2012, 12:23 PM	#9
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel No I havent but it is on gravel so might not be evident. I just bought it so havent had any time to study the situation yet. Could it be from that filter box (dont know the technical term) with the bleeder to the engine, or would it be from the box with bleeder back to the tank or all of the above? Appreciate your input! Tim

03-14-2012, 01:04 PM	#10
chevymotocross Registered User Join Date: May 2007 Location: East Haven, CT Posts: 882	Re: just bought 85 K-20 6.2L diesel Now THAT'S a truck. __________________ 87 Chevy 2wd SWB: 305/700r4 Dual Exhaust, K&N Filter, Injector Pod Spacer, TBI Spacer, Belltech Front Sway Bar, Corvette Servo, Western Chassis 4/6 and c-notch

03-14-2012, 02:08 PM	#12
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel Good to know! I will have to get under and start looking.

03-14-2012, 04:08 PM	#13
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: just bought 85 K-20 6.2L diesel Also check out The Diesel Place. LOTS of very good info there on the 6.2. I know I love mine. I think I have read to get rid of the 'box' type filter and go with the older screw-on filter. __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-14-2012, 04:09 PM	#14
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: just bought 85 K-20 6.2L diesel BTW, that is a VERY nice truck you got. __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-14-2012, 04:11 PM	#15
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel Thanks Lance! That isnt a bad idea at all. That box filter thingey which never having owned one of these is alien to me anyway, looks like a problem waiting to happen.

03-14-2012, 08:24 PM	#16
Mattman2010 Registered User Join Date: Jun 2010 Location: Pittsburg, KS Posts: 953	Re: just bought 85 K-20 6.2L diesel If it has dual tanks check the tank switch under the truck on the passenger side. When I first converted my truck to a 6.2 my switch was letting air in and I couldn't keep it running. Once I got the switch swapped out with another one I had laying around it starts right up. __________________ 1980 K10 - 6.2L Diesel/SM465/NP205 Build Thread 1984 K30 CC Dually - "The Tank" 12V Cummins/Nv4500/Np205/D60/D70HD 4" lift & 37's Build Thread 1960 C-60 Dump Truck Make it road worthy! Thread



Register or Log In To remove these advertisements.

03-15-2012, 06:38 AM	#17
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: just bought 85 K-20 6.2L diesel Box filter works fine, nee to check the o rings on the screws. There's a thread on it over at DP. Remember, keep an eye on temp and oil, check those oil cooler lines (LH rear of block). __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

03-15-2012, 07:54 AM	#18
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,550	Re: just bought 85 K-20 6.2L diesel Your leak is most likely out the back of the fuel filter base from the differential pressure sensor. They leaked enough that GM/Stanadyne stopped putting the sensor in that filter in about 1988 or so. Get a different housing that doesn't have the sensor. I'm on my 4th 6.2 diesel truck and 3 of them have leaked there. The one that doesn't is an 82 and has the old round filters... The square filter works great otherwise and is very quick and easy to change. I wouldn't get rid of it... __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

03-15-2012, 07:56 AM	#19
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,550	Re: just bought 85 K-20 6.2L diesel Here's a replacement switch (not mine). http://www.ebay.com/itm/Stanadyne-Va...48f826&vxp=mtr __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

03-15-2012, 08:15 AM	#20
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: just bought 85 K-20 6.2L diesel Nice truck! That's exactly what I've been looking for. I even posted my diesel '85 Jimmy for trade for a truck like that. Great find.I just can't find one around here. Definitely air getting in there. Look for seepage.It could be anywhere...in front of or behind the filter/water separator. Does it start right up after bleeding or still crank a while? Definitely look for seepage from tank to injectors,but when an injector pump goes it will get hard to start. But,it's all the time. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

03-15-2012, 08:53 AM	#21
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel Thanks all! I will be checking all those things as soon as I have time to get on it. All great information that I appreciate! Tim

03-15-2012, 10:59 AM	#22
Eyegore What Hump? Join Date: Apr 2003 Location: New River AZ Posts: 2,009	Re: just bought 85 K-20 6.2L diesel Really nice truck need more pics though __________________ Lil red 86 c-10 99 Sub 78 Camper Special w/ 454

03-15-2012, 11:06 AM	#23
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: just bought 85 K-20 6.2L diesel Will try to do that soon. Might take a while though b/c I am tied up with some training and have been crazy busy.

03-15-2012, 08:28 PM	#24
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: just bought 85 K-20 6.2L diesel A problem I had was where the injector return line T's in to the hard line (right behind the alternator). The little hose coming off the injector went bad and made my burb difficult to start. The hose was an old cloth covered rubber POS. It would fire up then immediately die. Once I replaced that hose and double checked all the other connections...found a loose hose clamp too...the beast would fire right up. __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

03-15-2012, 10:25 PM	#25
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: just bought 85 K-20 6.2L diesel Awesome looking truck looks preety clean and well taken care of. Good luck on the air issues hope it's an easy fix for ya! Posted via Mobile Device __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Register or Log In To remove these advertisements.