94 Fuel Pump Issue
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Joined: Nov 2012
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From: East Tennessee
94 Fuel Pump Issue
I have a 94 F150 with a 4.9L engine. My fuel tank is the steel tank in the center of the frame with an in tank fuel pump. These pumps do not like ethanol gas at all, I get about 30,000 miles out of one if I'm lucky. I have been thinking about doing away with the in tank pump(this also gets electrical wires out of my GAS tank) and going to a frame mounted system like the 88-89 trucks have. Has anyone ever done this? Does the frame pump have the same pressure as the in tank pump? Any thoughts? Thank you.
Fleet Mechanic
Joined: Aug 2015
Posts: 1,838
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From: Candy Mountain
The earlier trucks have in tank pumps as well. The earlier system works fine, but there are more parts, so more to go wrong. In tank low pressure pump, in-line fuel reservoir/filter/selector assembly, high pressure pump, then the standard fuel filter. If your problem is ethanol eating pumps then I don't see how having 2 pumps would improve the situation.
I think you would be wiser to consider other explanations for your repeated pump failures.
You would not have a selector/reservoir assembly in a one tank truck.
I think you would be wiser to consider other explanations for your repeated pump failures.
Last edited by R&RFord; Nov 14, 2019 at 08:20 PM. Reason: Further Clarity
Hotshot
Joined: Jun 2015
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I have a 94 F150 with a 4.9L engine. My fuel tank is the steel tank in the center of the frame with an in tank fuel pump. These pumps do not like ethanol gas at all, I get about 30,000 miles out of one if I'm lucky. I have been thinking about doing away with the in tank pump(this also gets electrical wires out of my GAS tank) and going to a frame mounted system like the 88-89 trucks have. Has anyone ever done this? Does the frame pump have the same pressure as the in tank pump? Any thoughts? Thank you.
Fleet Mechanic
Joined: Aug 2015
Posts: 1,838
Likes: 367
From: Candy Mountain
Thanks RLA. I didn't think about the need for a fuel reserve to keep up with the demand of the high pressure pump even in a one tank system.
To the OP, a 94 will not have a fuel selector/reservoir as there is no need for one with the newer fuel delivery set up.
To the OP, a 94 will not have a fuel selector/reservoir as there is no need for one with the newer fuel delivery set up.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
You are correct. I was responding to the other post regarding downgrading to the older style fuel system with 2 pumps and a fuel reservoir.
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