Fuel from tank to pump - The 1947 - Present Chevrolet & GMC Truck Message Board Network

srfinatsunset · 08-31-2019, 03:53 PM

The fuel pump is not pumping (sucking) fuel from the tank. I was able to get the fuel pump to pump (suck) from a 5 gallon jug that was right under the pump. The fuel tank had at least 5 gallons of fuel in it. Could it be a warn out fuel pump? Do I need to prime the fuel line? I park the burb on the street which is on a hill. Nothing crazy but gravity goes down hill. (Fuel will flows back to the tank) would an electric fuel pump be better?

**Getter-Done** · 08-31-2019, 04:04 PM

The sock filter on the sending unit may be clogged?
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**HO455** · 08-31-2019, 05:50 PM

There is a short (6") piece of hose about halfway between tank and the pump on the passenger side in front of the cross member. The front line and the back line have 90* bends and the hose hooks them together.
It can get old and hard and allow air to be sucked into the line. Photo shows where it is but I have removed the bends and replaced the hose with a pair of compression fittings and a short piece of hard line.

srfinatsunset · 09-01-2019, 09:57 PM

I’m dealing with an auxiliary tank. And extra lines. No fuel in the lines. I don’t really want the auxiliary tank. I cut the bends out of the fuel lines and now I have a straight fuel line to the original tank. I have clear fuel filter under the the fuel pump. Durning idol fuel is trickling into the fuel filter. When I press on the throttle the engine revs up, the engine doesn’t stall. But I don’t see an increase in fuel in the fuel filter.

**HO455** · 09-01-2019, 10:26 PM

Are you having issues with how the truck runs? I have never seen a clear fuel filter that was completely full even if it was mounted vertically. If the truck is running good I would toss that clear filter, put a metal one it its place and never look back.

pwdcougar · 09-03-2019, 06:24 PM

Have you tried to test the fuel pump? You can remove the line from the fuel filter, add a fuel line to it and observe the fuel flow when cranking the engine. Ground the coil wire and have someone standing next to you with a fire extinguisher. I've over simplified this but there should be videos on doing this. The end of the fuel line should be directed into a plastic jug.

Paul

vectorit · 09-04-2019, 03:18 PM

Vent plugged?
Have you tried with out the gas cap on?
Could be a plugged line in the tank from the sock degrading or filled with junk too.

srfinatsunset · 09-04-2019, 04:01 PM

This weekend I will drop the tank and see what’s going on with it. I need to check the carb filters along with replacing the rubber tank lines.

08-31-2019, 03:53 PM	#1
srfinatsunset Registered User Join Date: Jun 2017 Location: Oak View CA Posts: 58	Fuel from tank to pump The fuel pump is not pumping (sucking) fuel from the tank. I was able to get the fuel pump to pump (suck) from a 5 gallon jug that was right under the pump. The fuel tank had at least 5 gallons of fuel in it. Could it be a warn out fuel pump? Do I need to prime the fuel line? I park the burb on the street which is on a hill. Nothing crazy but gravity goes down hill. (Fuel will flows back to the tank) would an electric fuel pump be better? Attached Images

08-31-2019, 04:04 PM	#2
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,442	Re: Fuel from tank to pump The sock filter on the sending unit may be clogged? . __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

08-31-2019, 05:50 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: Fuel from tank to pump There is a short (6") piece of hose about halfway between tank and the pump on the passenger side in front of the cross member. The front line and the back line have 90* bends and the hose hooks them together. It can get old and hard and allow air to be sucked into the line. Photo shows where it is but I have removed the bends and replaced the hose with a pair of compression fittings and a short piece of hard line. Attached Images __________________ 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

09-01-2019, 09:57 PM	#4
srfinatsunset Registered User Join Date: Jun 2017 Location: Oak View CA Posts: 58	Re: Fuel from tank to pump I’m dealing with an auxiliary tank. And extra lines. No fuel in the lines. I don’t really want the auxiliary tank. I cut the bends out of the fuel lines and now I have a straight fuel line to the original tank. I have clear fuel filter under the the fuel pump. Durning idol fuel is trickling into the fuel filter. When I press on the throttle the engine revs up, the engine doesn’t stall. But I don’t see an increase in fuel in the fuel filter.

09-01-2019, 10:26 PM	#5
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: Fuel from tank to pump Are you having issues with how the truck runs? I have never seen a clear fuel filter that was completely full even if it was mounted vertically. If the truck is running good I would toss that clear filter, put a metal one it its place and never look back. __________________ 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

09-03-2019, 06:24 PM	#6
pwdcougar Registered User Join Date: Oct 2013 Location: New Jersey Posts: 1,307	Re: Fuel from tank to pump Have you tried to test the fuel pump? You can remove the line from the fuel filter, add a fuel line to it and observe the fuel flow when cranking the engine. Ground the coil wire and have someone standing next to you with a fire extinguisher. I've over simplified this but there should be videos on doing this. The end of the fuel line should be directed into a plastic jug. Paul __________________ "You know that little thing in your head that keeps you from saying things you shouldn't? Yeah well, I don't have one of those" 1969 Mercury Cougar Standard 4 speed 1969 Mercury Cougar XR7 convertible 1970 4WD Chevrolet Suburban 1997 4WD Chevrolet Silverado Extended Cab Short Bed (purchased new January 1997)

09-04-2019, 03:18 PM	#7
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: Fuel from tank to pump Vent plugged? Have you tried with out the gas cap on? Could be a plugged line in the tank from the sock degrading or filled with junk too. __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

09-04-2019, 04:01 PM	#8
srfinatsunset Registered User Join Date: Jun 2017 Location: Oak View CA Posts: 58	Re: Fuel from tank to pump This weekend I will drop the tank and see what’s going on with it. I need to check the carb filters along with replacing the rubber tank lines.



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