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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Same EFI problem

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Old Jan 15, 2008 | 06:05 PM
  #1  
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HMR-RSQ
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Question Same EFI problem

Same EFI problem

<HR style="COLOR: #666666" SIZE=1><TABLE><TBODY><TR><TD vAlign=top width="100%">Ok guys, here goes again.
As long as I'm on the interestate and going 65mph no problems.
But let me run around town and have to push the truck to pull it'll start bucking.
New; FORD Parts;
front and rear pumps FORD OEM's complete assy's.
fuel switching canister, fuel filter
tank selector switch
both eec and fuel pump relays
tps
New tuneup parts, etc.

Can this truck run w/o the hi-pressure pump along the frame.
When I pulled the 5th wheel camper last it started this mess and smelled almost like it was leaning out. No cat on exhaust, so its not stopped up/clogged. It got so bad pulling the mountain that I had to stop and lock in 4lo to pull the last bit.
This is driving me crazy. Seems the hotter it gets (both ambient and eng. temps) it get's worse. I can back off on the throttle and it'll even out, but as soon as I'm back in it, it'll start back.
This one is kickin' my butt.
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Old Jan 15, 2008 | 06:14 PM
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From: Easton,Ks
I would tape a fuel pressure gauge to the windshield and if the pressure drops below 30 psi I would change the rail fuel pump. As you go to WOT the pressure should go up to near 40 psi.
 
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Old Jan 15, 2008 | 06:17 PM
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Can it still run normal with the rail pump lossing pressure?
 
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Old Jan 15, 2008 | 06:27 PM
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From: Easton,Ks
Originally Posted by HMR-RSQ
Can it still run normal with the rail pump lossing pressure?
No, the rail pump must put out at least 30 psi to keep the engine running.
 
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Old Jan 15, 2008 | 06:33 PM
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Its going to buddies shop that used to work for a Ford truck dealership. Hopefully he'll figure it out.. Thanks for the help!!!
 
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