Fuel problems I need help with
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1st Gear
Joined: Jul 2022
Posts: 1
Likes: 0
From: Portland oregon
Fuel problems I need help with
Here it is. My truck is running great I have been working on it for about 3 years now. In order to get it to be my daily driver. Here is my sudden problem.
I pull into the driveway everything is fine. The next morning BAM it won't start. I have narrowed it down to fuel delivery. From there I am stumped. At first it seemed that the pump was pumping fuel because of wetness at the carb. I disconnected the hoses from the pump to the carb no fuel. I disconnected the line into the pump no fuel so it doesn't seem to be the pump.
Now What? I've changed the screw in filter and recently changed the strainer in the fuel pump. Why do I suddenly have a non running truck and no fuel
I pull into the driveway everything is fine. The next morning BAM it won't start. I have narrowed it down to fuel delivery. From there I am stumped. At first it seemed that the pump was pumping fuel because of wetness at the carb. I disconnected the hoses from the pump to the carb no fuel. I disconnected the line into the pump no fuel so it doesn't seem to be the pump.
Now What? I've changed the screw in filter and recently changed the strainer in the fuel pump. Why do I suddenly have a non running truck and no fuel
Cargo Master
Joined: Dec 2015
Posts: 2,253
Likes: 346
Welcome to the site. Have you ever replaced the fuel lines? Did the truck sit for years? What fuel tank are you using, in-cab or saddle tank or both? What kind of truck and engine are we talking about? On my 70 f250 I was having a fuel delivery problem off and on. Eventually, I ran new rubber fuel line from my saddle tank to the fuel pump and it cured the problem. This was a temporary fix and I have still not got around to making a new fuel line yet. I figured there is rust or something in the line that moves and blocks off fuel. I had to blow air back through my filler neck to get fuel again. When I make new metal fuel lines for my 72 f250 I will do the 70 as well.
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
It can still be the pump. They don’t like to sit for extended periods of time, especially after they’ve been used a little bit.
Not having fuel at the inlet could indicate multiple things, including that the pump is not sucking enough to re-prime itself.
And depending upon which tank and the condition of the other lines, it might not gravity feed and self prime to help the pump.
And just to be the guy that says so out loud, are you sure you have enough fuel in the tank? :-)
Not having fuel at the inlet could indicate multiple things, including that the pump is not sucking enough to re-prime itself.
And depending upon which tank and the condition of the other lines, it might not gravity feed and self prime to help the pump.
And just to be the guy that says so out loud, are you sure you have enough fuel in the tank? :-)
Tuned
Joined: Jul 2019
Posts: 464
Likes: 80
From: Evansville, Indiana
Here it is. My truck is running great I have been working on it for about 3 years now. In order to get it to be my daily driver. Here is my sudden problem.
I pull into the driveway everything is fine. The next morning BAM it won't start. I have narrowed it down to fuel delivery. From there I am stumped. At first it seemed that the pump was pumping fuel because of wetness at the carb. I disconnected the hoses from the pump to the carb no fuel. I disconnected the line into the pump no fuel so it doesn't seem to be the pump.
Now What? I've changed the screw in filter and recently changed the strainer in the fuel pump. Why do I suddenly have a non running truck and no fuel
I pull into the driveway everything is fine. The next morning BAM it won't start. I have narrowed it down to fuel delivery. From there I am stumped. At first it seemed that the pump was pumping fuel because of wetness at the carb. I disconnected the hoses from the pump to the carb no fuel. I disconnected the line into the pump no fuel so it doesn't seem to be the pump.
Now What? I've changed the screw in filter and recently changed the strainer in the fuel pump. Why do I suddenly have a non running truck and no fuel
Take the fuel line off at pump inlet like you already have. Use an air compressor...or like I did, clean the line and blow through it getting that good gas taste. You should hear air escaping at the fuel cap. If you have the in cab tank, you can take the sending unit off and shine a light into the tank and see what it looks like. Make sure there isn't anything floating that can plug up the where the fuel comes out of the tank and into the fuel line.
Something else you could do to prove the pump is good, get 6' of rubber 3/8" fuel hose and run it to a gas can on the ground in front of the truck. I highly recommend, no matter what, you install a fuel pressure gauge so you can rule out issues faster in the future.
Tuned
Joined: May 2010
Posts: 281
Likes: 9
From: Benton City, Wa
Buy & install an inline electric fuel pump and put it on a switch.Something like
Low pressure, low volume. Hit the switch before cranking & turn it off after starting. It'll keep pressure to your mechanical fuel pump so it can push fuel to the carb. My truck did the same thing you describe and this solved my starting problem which was the fuel line from the mechanical pump was draining back/evaporating and the carb wasn't getting any fuel. 99% was when the weather was hot or the truck sat for extended time. Sort of like being vapor locked.
The mechanical pump WILL draw fuel thru the electric one without it running.
Dan
The mechanical pump WILL draw fuel thru the electric one without it running.
Dan
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Years ago I was having the same problem with my Bump. I blew some of my breath air back in the pump's feed line to see if there was blockage. No blockage but I heard gurgling sound back by the tank but outside of it. Looking on the ground I noticed a small puddle of gas. Looking straight up I saw gas had leaked out where a rubber fuel hose was clamped to the metal frame fuel line. That rubber hose was old and stiff. It must have shrunk inside and out. Replaced that rubber hose with new and the pump could now draw gas out of the tank.
Cross-Country
Joined: Apr 2024
Posts: 55
Likes: 23
Oops, meant to post in the Marty's E Fuel thread. Not sure how I goofed that up.
https://www.ford-trucks.com/forums/1753643-martys-e-fuel-kit.html
https://www.ford-trucks.com/forums/1753643-martys-e-fuel-kit.html
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5th Wheeling
Joined: Feb 2024
Posts: 49
Likes: 9
Here it is. My truck is running great I have been working on it for about 3 years now. In order to get it to be my daily driver. Here is my sudden problem.
I pull into the driveway everything is fine. The next morning BAM it won't start. I have narrowed it down to fuel delivery. From there I am stumped. At first it seemed that the pump was pumping fuel because of wetness at the carb. I disconnected the hoses from the pump to the carb no fuel. I disconnected the line into the pump no fuel so it doesn't seem to be the pump.
Now What? I've changed the screw in filter and recently changed the strainer in the fuel pump. Why do I suddenly have a non running truck and no fuel
I pull into the driveway everything is fine. The next morning BAM it won't start. I have narrowed it down to fuel delivery. From there I am stumped. At first it seemed that the pump was pumping fuel because of wetness at the carb. I disconnected the hoses from the pump to the carb no fuel. I disconnected the line into the pump no fuel so it doesn't seem to be the pump.
Now What? I've changed the screw in filter and recently changed the strainer in the fuel pump. Why do I suddenly have a non running truck and no fuel
Disconnecting the line into the pump and not getting fuel doesn't definitively mean it's not the pump, it may not prime unless the pump is running. With the key "on" you should hear/feel that pump pulsating or whirring. I think you're missing something simple, fuel pump or fuel pump relay. Both can easily be tested with a multimeter.
I catch flack from my older friends and uncles whenever I swap out an old points style fuel pump for a modern low flow one, but I'll sacrifice "originality" any day if it means she's a daily driver.
I tell them when you're stranded on the side of the road because a 50 year old fuel pump gave out you won't be so proud to tell the tow truck driver that it's original...
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