1968 c10 died - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Domingo · 04-08-2018, 09:40 PM

1968 c10. Died on my son Wednesday, got it home and the fuel bowls empty. I tought fuel pump, replace with a new acdelco from summit racing, now Sunday truck dies again. Replaced the fuel filter as well.
One thing the has me concern the fuel line coming from the tank to the fuel pump it was dry. Could it be a plugged gas pick up it has a 21 gallon gas tank from brothers(blazer) 4 years old
any ideas could it just be another bad pump

**HO455** · 04-08-2018, 10:18 PM

Could be plugged or since it is a suction line it could have a hole somewhere before the tank allowing it to suck air and not fuel. Or the really annoying and hard to find, flap of loose rubber inside of the hose. ( been there it took days of frustration and some luck to solve)
Test your pump by running a suction line from it to a can of gas and crank the truck to see if the float bowl fills up. With the gas we have to use nowdays it isn't out of the question for a hose to fail in four years.

Barnfind46 · 04-09-2018, 02:52 PM

Could be vaporlock. How warm was it there on the days you had the problem? We have 10% ethanol here and it will start to boil in the fuel line at 190 degrees. We had a couple of 80 degree days and my truck sat down on me. I had a clear fuel filter and I could watch it boil and turn to vapor. Just a thought.

Rufas · 04-09-2018, 08:10 PM

The fuel sock on the fuel pickup line inside the tank could be plugged. Pull the tank sending unit out and check it

Domingo · 04-09-2018, 08:24 PM

The temp was about 75, I dont think it was vapor lock.
I'm going to replace all the rubber lines with steel and drop and check the tank

Domingo · 04-09-2018, 11:59 PM

Update. Removed tank, tank was clean. Braided fuel hose was dry and falling apart, maybe it was collapsing and keeping fuel from getting to fuel pump

**special-K** · 04-10-2018, 07:29 AM

First of all, these trucks don't die, they just need some health care from time to time. The line could very well be collapsing. Do you mean the short piece at the tank outlet that allows for body to chassis flex, or did someone replace the hard line to the pump with something that doesn't belong, known to result in issues on down the road? Same for pump to carb, should be hard line all the way.

Domingo · 04-10-2018, 09:02 AM

It was about 3 feet of rubber line I'm going to replace with hard line from the tank to the pump

El Dorado Jim · 04-10-2018, 05:27 PM

sub'd

demian5 · 04-10-2018, 07:10 PM

Clogged vent in the tank would cause it to run for a while, be k, then not be able to suck anymore fuel as the vacuum in the tank would overcome the suction of the pump.

Loosen or pull off the gas cap and try again.

**special-K** · 04-11-2018, 09:33 PM

Definitely was to get rid of that cobble job fuel line. It needs to be metal to be right and safer.

Domingo · 04-14-2018, 11:24 PM

Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives

jjzepplin · 04-15-2018, 05:04 AM

Never seen that before. I use electric pumps though.

**HO455** · 04-15-2018, 02:44 PM

Someone correct me if I am wrong but it may be possible to install the pump with the lever on the top of the cam if the lobe is in just the right position. I've seen this on a non Chevy engine before. Or simply just another quality part from a distant shore.

**Steeveedee** · 04-15-2018, 02:49 PM

Quote:

Originally Posted by HO455

Someone correct me if I am wrong but it may be possible to install the pump with the lever on the top of the cam if the lobe is in just the right position. I've seen this on a non Chevy engine before. Or simply just another quality part from a distant shore.

You can do that on Ponchos and Fords, but the lever is too short on the Chevy pump.

**HO455** · 04-15-2018, 03:02 PM

Its been awhile since highschool auto shop, too long to remember what car it happened to. I think it might have been a friends Ranchero. I do remember the lesson about it and how the oil pan had to come off the get the missing end of the lever. I must have learned the lesson well enough. I've done at least half dozen Poncho pumps over the years and never had to pull the pan. (Yet!!!)

Thanks for the information.

Hutch · 04-15-2018, 04:24 PM

When replacing the pump there is a bolt on the block that will hold the internal shaft in place during the installation

Last time I replaced mine there were some pumps that were really cheap that stated that they were for the non-ethanol fuel

**Boog** · 04-15-2018, 04:57 PM

Quote:

Originally Posted by Domingo

Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives

That doesn't look like a Delco pump. Inferior parts is my guess.

**Steeveedee** · 04-15-2018, 06:58 PM

Quote:

Originally Posted by Domingo

Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives

Didn't see that earlier. I'd say it's defective. I've never seen anything like that, in many years of wrenching.

truckster · 04-15-2018, 07:40 PM

Delco isn't what it used to be. The last AC/Delco part I bought from a dealer had "made in China" stamped on it.

Domingo · 04-15-2018, 08:02 PM

I bought the pump from summit racing. Now I'm buying another from napa auto parts. Summit racing refunded my money no question asked. They are great and will keep getting my business

Domingo · 04-15-2018, 08:02 PM

Just now I got a bad taste of ac delco parts

**Steeveedee** · 04-15-2018, 11:37 PM

Quote:

Originally Posted by truckster

Delco isn't what it used to be. The last AC/Delco part I bought from a dealer had "made in China" stamped on it.

I had a '68 skylark GS that I went large with a Chevy engine, and put a 4-row truck radiator in it. I went to the Chevy dealer to get the top clamps (where better to get the part, right?) and they were made in China.

[political "rant"] China will end up owning the US as the infrastructure continues to be off-shored. [/political "rant"]

RTHarvey · 04-15-2018, 11:53 PM

A number of years ago I had a 66 corvette with a 327. When I got it, it worked OK, unless you got on it. Then about haflway thru third gear it would just die. Pull over to the side, crank for a few seconds on it was OK again. Turned out that the pivot lever for the fuel pump had fallen out. The lever then moved out of position, but only a little bit as it ran into the inside wall of the pump body. This resulted in it getting about a third of the intended stroke on the lever. So long as there wasn't much demand, it could keep up, but when you started burning some fuel it couldn't.

04-08-2018, 09:40 PM	#1
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	1968 c10 died 1968 c10. Died on my son Wednesday, got it home and the fuel bowls empty. I tought fuel pump, replace with a new acdelco from summit racing, now Sunday truck dies again. Replaced the fuel filter as well. One thing the has me concern the fuel line coming from the tank to the fuel pump it was dry. Could it be a plugged gas pick up it has a 21 gallon gas tank from brothers(blazer) 4 years old any ideas could it just be another bad pump

04-08-2018, 10:18 PM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 1968 c10 died Could be plugged or since it is a suction line it could have a hole somewhere before the tank allowing it to suck air and not fuel. Or the really annoying and hard to find, flap of loose rubber inside of the hose. ( been there it took days of frustration and some luck to solve) Test your pump by running a suction line from it to a can of gas and crank the truck to see if the float bowl fills up. With the gas we have to use nowdays it isn't out of the question for a hose to fail in four years. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

04-09-2018, 02:52 PM	#3
Barnfind46 Registered User Join Date: Aug 2014 Location: Mena,Arkansas Posts: 485	Re: 1968 c10 died Could be vaporlock. How warm was it there on the days you had the problem? We have 10% ethanol here and it will start to boil in the fuel line at 190 degrees. We had a couple of 80 degree days and my truck sat down on me. I had a clear fuel filter and I could watch it boil and turn to vapor. Just a thought. __________________ 68' with no bells or whistles unless I add'em.

04-09-2018, 08:10 PM	#4
Rufas Registered User Join Date: May 2016 Location: Fort Mohave, AZ Posts: 370	Re: 1968 c10 died The fuel sock on the fuel pickup line inside the tank could be plugged. Pull the tank sending unit out and check it __________________ 1970 GMC 2500 700R Trans, RideTech 4 link rear suspension, air bagged on all four corners, factory upper/lower A-Arms, 2 inch drop spindles. 350 SBC 300hp Weiand Supercharger FiTech 30004 EFI

04-09-2018, 08:24 PM	#5
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: 1968 c10 died The temp was about 75, I dont think it was vapor lock. I'm going to replace all the rubber lines with steel and drop and check the tank

04-09-2018, 11:59 PM	#6
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: 1968 c10 died Update. Removed tank, tank was clean. Braided fuel hose was dry and falling apart, maybe it was collapsing and keeping fuel from getting to fuel pump

04-10-2018, 07:29 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1968 c10 died First of all, these trucks don't die, they just need some health care from time to time. The line could very well be collapsing. Do you mean the short piece at the tank outlet that allows for body to chassis flex, or did someone replace the hard line to the pump with something that doesn't belong, known to result in issues on down the road? Same for pump to carb, should be hard line all the way. __________________ "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 ~

04-10-2018, 09:02 AM	#8
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: 1968 c10 died It was about 3 feet of rubber line I'm going to replace with hard line from the tank to the pump

04-10-2018, 05:27 PM	#9
El Dorado Jim Registered User Join Date: Dec 2009 Location: El Dorado Ca Posts: 3,374	Re: 1968 c10 died sub'd

04-10-2018, 07:10 PM	#10
demian5 Registered User Join Date: Aug 2016 Location: Lake Forest, CA Posts: 2,177	Re: 1968 c10 died Clogged vent in the tank would cause it to run for a while, be k, then not be able to suck anymore fuel as the vacuum in the tank would overcome the suction of the pump. Loosen or pull off the gas cap and try again. __________________ "Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC

04-11-2018, 09:33 PM	#11
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1968 c10 died Definitely was to get rid of that cobble job fuel line. It needs to be metal to be right and safer. __________________ "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 ~

04-14-2018, 11:24 PM	#12
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: 1968 c10 died Im back. Removed tank replace all rubber hose with metal line tonight my son and I tried to fire it up no luck. Removed pump and behold the lever was broken what gives Attached Images

04-15-2018, 05:04 AM	#13
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,567	Re: 1968 c10 died Never seen that before. I use electric pumps though. __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

04-15-2018, 02:44 PM	#14
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 1968 c10 died Someone correct me if I am wrong but it may be possible to install the pump with the lever on the top of the cam if the lobe is in just the right position. I've seen this on a non Chevy engine before. Or simply just another quality part from a distant shore. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

04-15-2018, 03:02 PM	#16
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: 1968 c10 died Its been awhile since highschool auto shop, too long to remember what car it happened to. I think it might have been a friends Ranchero. I do remember the lesson about it and how the oil pan had to come off the get the missing end of the lever. I must have learned the lesson well enough. I've done at least half dozen Poncho pumps over the years and never had to pull the pan. (Yet!!!) Thanks for the information. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377



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04-15-2018, 04:24 PM	#17
Hutch Registered User Join Date: Oct 2001 Location: Grapevine, Tx. Posts: 2,142	Re: 1968 c10 died When replacing the pump there is a bolt on the block that will hold the internal shaft in place during the installation Last time I replaced mine there were some pumps that were really cheap that stated that they were for the non-ethanol fuel __________________ John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS

04-15-2018, 07:40 PM	#20
truckster Registered User Join Date: Jan 2001 Location: Orem, Utah Posts: 7,981	Re: 1968 c10 died Delco isn't what it used to be. The last AC/Delco part I bought from a dealer had "made in China" stamped on it. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

04-15-2018, 08:02 PM	#21
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: 1968 c10 died I bought the pump from summit racing. Now I'm buying another from napa auto parts. Summit racing refunded my money no question asked. They are great and will keep getting my business

04-15-2018, 08:02 PM	#22
Domingo Registered User Join Date: Dec 2016 Location: Brentwood, North California Posts: 80	Re: 1968 c10 died Just now I got a bad taste of ac delco parts

04-15-2018, 11:53 PM	#24
RTHarvey Registered User Join Date: Dec 2017 Location: Wichita, KS Posts: 62	Re: 1968 c10 died A number of years ago I had a 66 corvette with a 327. When I got it, it worked OK, unless you got on it. Then about haflway thru third gear it would just die. Pull over to the side, crank for a few seconds on it was OK again. Turned out that the pivot lever for the fuel pump had fallen out. The lever then moved out of position, but only a little bit as it ran into the inside wall of the pump body. This resulted in it getting about a third of the intended stroke on the lever. So long as there wasn't much demand, it could keep up, but when you started burning some fuel it couldn't.

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