dose not get gas when i go to start it - The 1947 - Present Chevrolet & GMC Truck Message Board Network

trukindud · 03-09-2010, 10:32 PM

i have a in line fule pump blazer tank my probalem is that i have to bleed the line just before the presure regulater and fule filter to get the fule pump to push the fule up to the carb every time i start it it will befine after that for the day but the next time i go to start it the fule pump wont push it tell i bleed the line agin any have an idea whats worng

**LockDoc** · 03-09-2010, 11:18 PM

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Where is your fuel pump located? I sounds like the fuel is siphoning back into the tank when the truck sets for very long.

LockDoc

trukindud · 03-10-2010, 12:29 AM

its in the frame

Ilike 72"s · 03-10-2010, 12:59 AM

I would guess one or all of your rubber lines is old and or rotted. That would let it pull air into the line and loose its pumping ability.
New rubber lines and new clamps might fix it.
Dennis

**LockDoc** · 03-10-2010, 01:39 AM

Quote:

Originally Posted by trukindud

its in the frame

Front, back, middle? There is a lot of frame there. I would locate it as close to the tank as possible.

LockDoc

67ChevyRedneck · 03-10-2010, 01:43 AM

Do you have your tank vented?

trukindud · 03-10-2010, 12:08 PM

tank is vented all new lines its at the lowest part of the frame at the back by the tank

trukindud · 03-10-2010, 12:12 PM

i should all so mention that it was working fine tell i ran out of gas

PowerPro · 03-10-2010, 12:17 PM

Quote:

Originally Posted by trukindud

i should all so mention that it was working fine tell i ran out of gas

If you ran it out of gas and left the electric pump running, you could have easily ruined the inside of the pump. Electric pumps are cooled/lubricated by the fuel flowing through them.

Another thought would be to put a check valve in the line behind the fuel pump to prevent fuel from flowing back to the tank. These can be restrictive, so you may want to get a large one and use some fittings to step the size back down to 3/8 or whatever size fuel line you are using.

rico7769 · 03-10-2010, 11:34 PM

If I'm not mistaken, I had an elec fuel pump inline that had a built in device to prevent backflow as part of its design. Also, it seems that the vacuum created between the sending unit "dipstick" being immersed and the fuel pump should cause the gas to be stagnant. Think of it like a straw. If you suck the water through it and keep it in your mouth, the water will stay in the straw. Same principle. Also, running the pump dry would toast the seal inside because of the fuel regulating the temp in the pump like the previous post said and cause it to not hold back the fuel. Not sure where it would get the air in the line to cause it to siphon though, something in the line/tank would have to introduce air to start the vacuum process in the other direction generate a vacuum . But then again, I'm no scientist, just a guess. I'm curious to see how this one comes out. Good luck

trukindud · 03-16-2010, 07:09 PM

well got it fixed after checking the line and finding no losses or leaking conetion i checked the fule filter it seamed to be good

i was talking with my pa and he said to check the return line so i checked the return on the fule filter it had no flow though the return part

put a new one on and now it works great thanks for all of your help

cdowns · 03-16-2010, 07:32 PM

i love the mechanical pumps

03-09-2010, 10:32 PM	#1
trukindud Registered User Join Date: Jul 2007 Location: hooper ut Posts: 77	dose not get gas when i go to start it i have a in line fule pump blazer tank my probalem is that i have to bleed the line just before the presure regulater and fule filter to get the fule pump to push the fule up to the carb every time i start it it will befine after that for the day but the next time i go to start it the fule pump wont push it tell i bleed the line agin any have an idea whats worng __________________ 64 buick skylark 65 buick skylark 67 chevy 2wd Lb 68 2w Lb 05 chevy colbalt

03-09-2010, 11:18 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: dose not get gas when i go to start it - Where is your fuel pump located? I sounds like the fuel is siphoning back into the tank when the truck sets for very long. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

03-10-2010, 12:29 AM	#3
trukindud Registered User Join Date: Jul 2007 Location: hooper ut Posts: 77	Re: dose not get gas when i go to start it its in the frame __________________ 64 buick skylark 65 buick skylark 67 chevy 2wd Lb 68 2w Lb 05 chevy colbalt

03-10-2010, 12:59 AM	#4
Ilike 72"s Registered User Join Date: Jan 2007 Location: eastern oregon Posts: 623	Re: dose not get gas when i go to start it I would guess one or all of your rubber lines is old and or rotted. That would let it pull air into the line and loose its pumping ability. New rubber lines and new clamps might fix it. Dennis

03-10-2010, 01:43 AM	#6
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: dose not get gas when i go to start it Do you have your tank vented? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

03-10-2010, 12:08 PM	#7
trukindud Registered User Join Date: Jul 2007 Location: hooper ut Posts: 77	Re: dose not get gas when i go to start it tank is vented all new lines its at the lowest part of the frame at the back by the tank __________________ 64 buick skylark 65 buick skylark 67 chevy 2wd Lb 68 2w Lb 05 chevy colbalt

03-10-2010, 12:12 PM	#8
trukindud Registered User Join Date: Jul 2007 Location: hooper ut Posts: 77	Re: dose not get gas when i go to start it i should all so mention that it was working fine tell i ran out of gas __________________ 64 buick skylark 65 buick skylark 67 chevy 2wd Lb 68 2w Lb 05 chevy colbalt

03-10-2010, 11:34 PM	#10
rico7769 Hybrid67 Join Date: Jan 2009 Location: Martinez, GA Posts: 195	Re: dose not get gas when i go to start it If I'm not mistaken, I had an elec fuel pump inline that had a built in device to prevent backflow as part of its design. Also, it seems that the vacuum created between the sending unit "dipstick" being immersed and the fuel pump should cause the gas to be stagnant. Think of it like a straw. If you suck the water through it and keep it in your mouth, the water will stay in the straw. Same principle. Also, running the pump dry would toast the seal inside because of the fuel regulating the temp in the pump like the previous post said and cause it to not hold back the fuel. Not sure where it would get the air in the line to cause it to siphon though, something in the line/tank would have to introduce air to start the vacuum process in the other direction generate a vacuum . But then again, I'm no scientist, just a guess. I'm curious to see how this one comes out. Good luck __________________ Keep em' Running! All show.....no go

03-16-2010, 07:09 PM	#11
trukindud Registered User Join Date: Jul 2007 Location: hooper ut Posts: 77	Re: dose not get gas when i go to start it well got it fixed after checking the line and finding no losses or leaking conetion i checked the fule filter it seamed to be good i was talking with my pa and he said to check the return line so i checked the return on the fule filter it had no flow though the return part put a new one on and now it works great thanks for all of your help __________________ 64 buick skylark 65 buick skylark 67 chevy 2wd Lb 68 2w Lb 05 chevy colbalt

03-16-2010, 07:32 PM	#12
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: dose not get gas when i go to start it i love the mechanical pumps __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY



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