No fuel
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Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
No fuel
79 F-250 460 stopped getting fuel.
I put a new fuel pump on, is it possible to fully install the pump, but have the arm not make proper contact?
I disconnected the fuel line at the tank and the pump and blew air through it, no blockage.
I blew compressed air into the fuel filler neck and fuel came out of the sender outlet.
There’s a new fuel filter at the carb.
I’m lost. Not familiar with older cars so much.
I put a new fuel pump on, is it possible to fully install the pump, but have the arm not make proper contact?
I disconnected the fuel line at the tank and the pump and blew air through it, no blockage.
I blew compressed air into the fuel filler neck and fuel came out of the sender outlet.
There’s a new fuel filter at the carb.
I’m lost. Not familiar with older cars so much.
Lead Driver
Joined: Jul 2017
Posts: 9,569
Likes: 1,158
From: San Jose, CA
Or your new pump could be defective. Problem with new parts is that they don't always work anymore. So you can hope, but you can't count on them.
Paul
Mountain Pass
Joined: Dec 2018
Posts: 116
Likes: 28
From: North Pole, Alaska
Last response on final posted quote I can relate to that....
Had installed a new fuel pump upon my fresh 390 rebuild waiting to start it up and break it in, only to find out this brand new fuel pump would not work and pump fuel at all....
Installed another new fuel pump I had onhand and it immediately started right up and ran....still working to this day with now reaching the 75,000 rebuilt mile mark on June 30, 2021.
There is other times like 1TonBasecamp stated with some fuel pumps - Sometimes you gotta' make it work.
Had installed a new fuel pump upon my fresh 390 rebuild waiting to start it up and break it in, only to find out this brand new fuel pump would not work and pump fuel at all....
Installed another new fuel pump I had onhand and it immediately started right up and ran....still working to this day with now reaching the 75,000 rebuilt mile mark on June 30, 2021.
There is other times like 1TonBasecamp stated with some fuel pumps - Sometimes you gotta' make it work.
Thread Starter
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Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
Thanks for the info Paul. To prime the pump, just fill the hose from pump to tank? Can I fill from Carb connection down?
Historically, if the truck sat for a day, I’d have to put gas in the carb to get it to suck gas from the tank. Previous people had mentioned the carb needing work.
But how do you suggest priming the pump?
Historically, if the truck sat for a day, I’d have to put gas in the carb to get it to suck gas from the tank. Previous people had mentioned the carb needing work.
But how do you suggest priming the pump?
Lead Driver
Joined: Oct 2018
Posts: 7,840
Likes: 2,348
if it's the correct pump it has to make contact.
How long did you crank it ? it can take a while that's why I feed it a little gas .
You could have a hose leaking , not bad enough you'd notice it blowing air back but enough it breaks suction.
i have had the sock on the intake plug with junk and kill the engine, so you blow it back with air and it runs until it sucks the gunk back again. in your case since it doesn't run at all I'd be more suspect of the lines.
How long did you crank it ? it can take a while that's why I feed it a little gas .
You could have a hose leaking , not bad enough you'd notice it blowing air back but enough it breaks suction.
i have had the sock on the intake plug with junk and kill the engine, so you blow it back with air and it runs until it sucks the gunk back again. in your case since it doesn't run at all I'd be more suspect of the lines.
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Tuned
Joined: Oct 2014
Posts: 306
Likes: 6
@440 sixpack cranked for some time. Usually putting fuel into the carb would help or suck gas.
moved to a fuel can off the fuel pump and it started fairly quick.
someone told me there’s something behind the float bowl cover that closes off when the trucks off. I know nothing of carbs. But basically, if this doesn’t seal it’s a vacuum break that would then cause the fuel supply line to drain back to the tank.
wondering if I couldn’t remove the cover and replace this part/seal while on the vehicle.
moved to a fuel can off the fuel pump and it started fairly quick.
someone told me there’s something behind the float bowl cover that closes off when the trucks off. I know nothing of carbs. But basically, if this doesn’t seal it’s a vacuum break that would then cause the fuel supply line to drain back to the tank.
wondering if I couldn’t remove the cover and replace this part/seal while on the vehicle.
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Logistics Pro
Joined: Oct 2006
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From: East Central Ia
There is a joint in your fuel line between cab and box from factory. There is a section of hose there. It may be dried and cracked open. Just a thought. Gas lines can get rusted also and develop pin holes.
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Lead Driver
Joined: Nov 2006
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From: Pa.
Our trucks came with rubber fuel line that will degrade with the use of fuel containing alcohol (rthanol). Replacing it all should be on your things of things to do.
You don't want to use old hose material compounded (manufactured) before the days of the alcohol blends, the gasolines we have today. Unless you know the exact rubber compound used on these old hoses as being alcohol compatible, they will degrade much "faster" with the modern gasolines, faster being a relative term here. Use modern fuel line materials compatible with alcohol by reviewing the specs from the manufacturer before you install it.
You don't want to use old hose material compounded (manufactured) before the days of the alcohol blends, the gasolines we have today. Unless you know the exact rubber compound used on these old hoses as being alcohol compatible, they will degrade much "faster" with the modern gasolines, faster being a relative term here. Use modern fuel line materials compatible with alcohol by reviewing the specs from the manufacturer before you install it.
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