Won’t pull gas from tank
Thread Starter
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Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
Won’t pull gas from tank
Been a while, don’t know if I posted this. Originally, my “new to me” ‘79 F250 would run from the gas tank, but took forever to get primed.
Finally, one day it wouldn’t start at all. If I put gas in the carb it would run fine. I replaced the fuel pump and still nothing.
I blew air down the fuel pump supply hose and it exited at the tank (hose removed there too.) I could blow air from the tank outlet into the tank as well. If I blew air from the filler neck, it came out the tank outlet hose as well. Based on this, I see no restrictions.
I ran a hose from a gas can to the new fuel pump and the truck starts almost immediately, what am I missing?
Finally, one day it wouldn’t start at all. If I put gas in the carb it would run fine. I replaced the fuel pump and still nothing.
I blew air down the fuel pump supply hose and it exited at the tank (hose removed there too.) I could blow air from the tank outlet into the tank as well. If I blew air from the filler neck, it came out the tank outlet hose as well. Based on this, I see no restrictions.
I ran a hose from a gas can to the new fuel pump and the truck starts almost immediately, what am I missing?
Lead Driver
Joined: Oct 2018
Posts: 7,877
Likes: 2,365
Inside the tank on the pickup tube there's a screen, sock , filter whatever you care to call it. if that plugs up it'll cause lots of problems. are you sure there's not an in line filter on the suction line ?
Usually you can blow air back and it cleans it off enough it'll start and run fine for a bit until it gunks up again. but who knows what yours looks like. you have to pull the tank and it's on the sending unit assembly.
Usually you can blow air back and it cleans it off enough it'll start and run fine for a bit until it gunks up again. but who knows what yours looks like. you have to pull the tank and it's on the sending unit assembly.
Lead Driver
Joined: Nov 2000
Posts: 6,628
Likes: 345
From: Albuquerque
If you replaced the suction rubber line be sure it is "suction" fuel line. Lines designed for pressure don't neccessarily protect from suction collapse.
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Tuned
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did this and it runs fine.
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Thread Starter
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Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
Thread Starter
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Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
It runs from a gas can right before the fuel pump, I’ll try moving the gas can to the line right where it comes from the tank.
Logistics Pro
Joined: Oct 2006
Posts: 4,029
Likes: 891
From: East Central Ia
There is a section in the fuel that has a hose at the back of the cab. When I replaced the rear section of tubing on my 78, it had been running fine. Moving it around enough it crumbled. Fuel pumps are kind of like old well hand pumps. Not too good at pumping air but work well when you get the liquid to them.
Tuned
Joined: Nov 2013
Posts: 333
Likes: 219
From: British Columbia
I had a similar issue with my 78 F350 when I bought it. Turned out the 44 year old rubber hose running from the in-cab fuel tank to the selector valve was dry rotted. Looked fine initially but further inspection showed tiny cracks allowing it to randomly suck air and cause the engine to die. 3 bucks worth of replacement fuel line cured the issue.
Thread Starter
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Tuned
Joined: Oct 2014
Posts: 306
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I had a similar issue with my 78 F350 when I bought it. Turned out the 44 year old rubber hose running from the in-cab fuel tank to the selector valve was dry rotted. Looked fine initially but further inspection showed tiny cracks allowing it to randomly suck air and cause the engine to die. 3 bucks worth of replacement fuel line cured the issue.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,189
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From: S/W Missouri, Polk county
Inside the tank on the pickup tube there's a screen, sock , filter whatever you care to call it. if that plugs up it'll cause lots of problems. are you sure there's not an in line filter on the suction line ?
Usually you can blow air back and it cleans it off enough it'll start and run fine for a bit until it gunks up again. but who knows what yours looks like. you have to pull the tank and it's on the sending unit assembly.
Usually you can blow air back and it cleans it off enough it'll start and run fine for a bit until it gunks up again. but who knows what yours looks like. you have to pull the tank and it's on the sending unit assembly.
Right on the money here. If you have replaced the fuel pump, and all rubber lines and or blow tested them for being clear. The last item is the sending unit, filter sock on the end of the pick up tube. And yes the only way to get the sending unit out is to normally drop the tank. Unless you have a 3" body lift or remove the bed.
Does it have duel tanks by chance?