Fuel Pump Question . .
Thread Starter
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Junior User
Joined: Aug 2009
Posts: 90
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From: Gainesville, GA
Fuel Pump Question . .
I always thought that a fuel pump would just fail. In other words, either it works or it doesn't. I want to verify that this thought process is correct. Has anyone had trouble with a fuel pump that starts to have lower output, especially when the engine is under load, or a fuel pump that that is intermittent or has pressure spikes and declines? Would this also be a sign of a failing fuel pump and if so what is the best type of pump to replace it with? OEM? or any other pumps recommended and where to buy?
Thanks,
Stuart
Thanks,
Stuart
Postmaster
Joined: Jan 2009
Posts: 2,544
Likes: 4
From: Suffolk, VA
I can't comment on an ailing pump on a PSD. When mine went out, it totally failed instantly.
I've had other vehicles in which a bad fuel pump would provide enough to idle or start out working ok, just to crap out a couple minutes later like you describe.
I've had other vehicles in which a bad fuel pump would provide enough to idle or start out working ok, just to crap out a couple minutes later like you describe.
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Junior User
Joined: Aug 2009
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From: Gainesville, GA
I am now thinking the pump because I have done everything else I can think to do: Cleaned tank, installed ITP kit with in-line filter, harpoon mod, DFA's CCK with regulated return, HPX, new air intake, oil and filter change, quarter mod on UVCH, injector buzz test -passed, KOEO passed, KOER passed, cylinder contribution test passed, EBPV deleted, new tranny. The truck runs much, much better but still has a miss/surge which is visible on the Tachometer. No codes except for the EBPV delete. I did discover that the Fuel Pressure regulator spring was weak by comparing it to a new one, not that it matters now that the FPR was deleted with the DFA CCK and regulated return. I am thinking fuel pump but do not have a set of gauges to confirm it. So back to my question, do they just up and die or do some of them like to suffer and under perform first?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
The most common cause, IMO, of Powerstroke fuel pump failures is not the pump, but the two screens in the fuel pickup and the single screen inside the inlet side of the pump itself getting clogged with debris.
The pump will continue to pump, maintain pressure for a good idle, but the fuel volume goes way down.
Fuel pressure then drops off a cliff and the truck falls on it's face when trying to accelorate or tow.
My solution was to relocate the fuel pump to the end of the fuel pickup in the tank, using a different pump with no screen inside the fuel pump inlet.
It has stainless steel rollers, so it just grinds up whatever it sucks up and the fuel filter cleans it up.
I change fuel filters more often than recommended, but so what. I can tow 13.5k up a 4% grade and not have to shift down.
The pump will continue to pump, maintain pressure for a good idle, but the fuel volume goes way down.
Fuel pressure then drops off a cliff and the truck falls on it's face when trying to accelorate or tow.
My solution was to relocate the fuel pump to the end of the fuel pickup in the tank, using a different pump with no screen inside the fuel pump inlet.
It has stainless steel rollers, so it just grinds up whatever it sucks up and the fuel filter cleans it up.
I change fuel filters more often than recommended, but so what. I can tow 13.5k up a 4% grade and not have to shift down.
Thread Starter
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Junior User
Joined: Aug 2009
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From: Gainesville, GA
Excuse my ignorance, I am fairly new to the forum, what is a bump?
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
A bump is a new post to "bump" your thread to the top without really answering the question.
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Thread Starter
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Junior User
Joined: Aug 2009
Posts: 90
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From: Gainesville, GA
Please tell me more about the screen on the inlet side of the pump . . Is it inside the pump or is where I can visually inspect it by disconnecting a hose. I don't recall seeing a screen when I connected a new fuel line to the inlet . . .
Thread Starter
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Junior User
Joined: Aug 2009
Posts: 90
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From: Gainesville, GA
Assuming this screen is clean does anyone think my pump is slowly dying?
Postmaster
Joined: Jan 2009
Posts: 2,544
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From: Suffolk, VA
Did this start happening right after, or very soon after you did the ITP in-tank mod and filter? If it did I have two more things to throw at you. When I did the ITP mod, it ran great and the day after I drove from VA to TN. That night the pump died.
Also, were you careful to get that black strainer on the bottom of the pick up in the tank in the same location as before? You could be bottoming it out on the tank floor.
Also, were you careful to get that black strainer on the bottom of the pick up in the tank in the same location as before? You could be bottoming it out on the tank floor.
Thread Starter
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Junior User
Joined: Aug 2009
Posts: 90
Likes: 0
From: Gainesville, GA
Did this start happening right after, or very soon after you did the ITP in-tank mod and filter? If it did I have two more things to throw at you. When I did the ITP mod, it ran great and the day after I drove from VA to TN. That night the pump died.
Also, were you careful to get that black strainer on the bottom of the pick up in the tank in the same location as before? You could be bottoming it out on the tank floor.
Also, were you careful to get that black strainer on the bottom of the pick up in the tank in the same location as before? You could be bottoming it out on the tank floor.