fuel problems
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Freshman User
Joined: Feb 2011
Posts: 27
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From: in the country
fuel problems
i have been having this problem for 3 weeks now i thought it was the carb so i rebuild it and it still has the problem, whats happing is when im doing 55mph or more after a minute of driving the truck acts like its running out of fuel i drop down to 35 it starts to run again. i have been scratching my head at this for a while could it be a fuel pump i have never seen a pump work one minute then not work the next it has a new fuel pressure valve on it as well if anybody has any ideals please let me know i cant even tow with the truck right now
Senior User
Joined: Jun 2010
Posts: 127
Likes: 1
Sounds like it could be the fuel filter. My experience with these is they get partially blocked, but work in town. However, when you get out on the highway it runs very rough and loses power until you get back to a lower speed. If it's been a while since you replaced your fuel filter, you might try that. The next step would be to check the codes from the computer.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Have you checked the fuel pump's output pressure and flow rate?
This could also be caused by sediment, crap and/or a disintegrating filter in the bottom of the tank.
I would drop the tank and investigate inside.
This could also be caused by sediment, crap and/or a disintegrating filter in the bottom of the tank.
I would drop the tank and investigate inside.
FTE Legend
Joined: May 2008
Posts: 56,542
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From: In my own world
did you set the float level when you rebuilt the carb? could be that you are running out of fuel because there is not enough available
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Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
i changed the fuel filter on the truck plus i installed an aftermarket fuel filter before the fuel pump on the frame rail where would the tank vent be?
This system consists of...
1: The Charcoal Canister.
2: Canister Purge Solenoid (or valve)
3: Vapor lines from fuel tank(s) to charcoal canister.
4: Non-vented Fuel Caps
5: PCV valve (For purge operation of Charcoal Canister)
Trucks without evaporative emissions vent through the Fuel Caps. Why it's so important to get the right fuel caps.
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Fuel Pump along the frame rail? Aftermarket filter? This does not seem right. Do you have pictures?
I need some information...
What year is the truck?
What size engine?
What Model? (F-100/F-350)
Feedback Carb, or regular carb?
Single or Dual Tanks?
49 state or California Emissions?
Pictures of this Fuel pump would help. Carbed engines should have a mechanical pump located on the engine (with exceptions to the 460 with Hot Fuel Handling).
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Freshman User
Joined: Feb 2011
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From: in the country
I set the floats to spec I found out that my truck has dual fuel pumps in the tanks electric pumps what I think has happen is the screen in the front tank is rottten and almost clogged for 57 bucks I can get a new pump and screen I would use the back tank but it's got a quarter sized rust hole in it plus I have a heavy Duty hitch that is under the rear tank and it's welded to the frame
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Freshman User
Joined: Feb 2011
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From: in the country
ok thanks to everybody who replied to my post the problem the whole time was my fuel pump screen and the pump when i pulled it out of the tank it fell apart in my hand the pump was barely attached to the unit so i ended up changing the whole sending unit with new pump and screen set me back $150 bucks but i can drive highway speeds now and smoke hondas again thanks everybody