fuel pump

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Jan 12, 2000 | 01:52 PM

Tom Cullen

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fuel pump

If i disconnect my in tank fuel pump and add either an in-line electrical, or a mechanical, will the in tank pump still function as a pickup, or will i need a regular pickup to put in its place. This is a 90 F-150 5.0

Jan 12, 2000 | 03:39 PM

Phillip Guidry

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Joined: Jun 1999

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fuel pump

I've wondered about that myself and were going to wait until I had a prob to find out.It will be crutcial to match the pump pressures because of the change over valve for the dual tanks which is after the tank pumps, but before the frame pump.I think it will work as long as there is not a one-way check valve in the tank which the add on pump may have trouble sucking through.But I don't know,but I am interested. Why do you want/need to do this ?
Phillip

Jan 12, 2000 | 08:56 PM

Tom Cullen

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fuel pump

I need to know because I'm building a 351 with either a carberatour,and switch to a mechanical pumb, or mustang type mass air fuel injection.
If I use the Mass-air I'll probably add some higher flow injectors, and thought the in tank pump might not keep up. I'm hoping my pump will keep up. My brother had a 90-something mustang he put a 351 in place of the 302 and he did have to get a new fuel pump.

Jan 13, 2000 | 01:27 AM

Jay

Mountain Pass

Joined: Sep 1999

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fuel pump

I believe there is a one way check valve in the original pump, this is to prevent the fuel system from bleeding down the pressure which would cause delayed starts.More than likely you will have to drop the tank if you need to upgrade the fuel pump. I don't think a mechanical pump would give you enough fuel presure you will definately need an electrical one.Unless you go with carburated which in that case the origal pump should be efficiant. You might look into installing an adjustable fuel regulator.
Good luck with your project.

Jan 13, 2000 | 03:20 AM

Paul W.

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fuel pump

Recently I would be driving down the road in my 90
Ford F-150, I would hear a "whining" type noise that a fuel pump would make. The sound is audible in the cab for about 5 or 6 seconds and then go away. Few minutes later, it would come back. This was about 2 months ago. Haven't heard it since. Anyone ever heard of such of thing? Just wondering if I got a bad tank of gas or is it my fuel pump trying to tell me something. While this noise would be going, I would switch tanks. That didn't stop the noise.

Jan 13, 2000 | 03:49 AM

john

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Joined: Jun 1999

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fuel pump

ford uses a common high prssure pump after the fuel dual function reservior. the dual function reservior requires 5 psi to close the diaphram to whatever tank is not in use. it may work if you can find the room on the rail to mount it. have a good time with the gas lines they are a pain. i just dropped my front tank 19 gal and replaced my fuel pump. i have a 1995 5.0 f-150 4x4. my sender was bad too but it cost me 175.00 for the pump and they wanted an additional 100 and something for the sender at the supply house. i said screw it ill live with it.so the routings on the gas lines go from the pump in the tank to a dual function reservior,to a high presure pump,then to a fuel filter then to the injectors. well good luck but i would say it is worth a shot.

Jan 13, 2000 | 08:54 AM

Phillip Guidry

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Joined: Jun 1999

Posts: 1,525

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fuel pump

If you go with mass air, you already have a high pressure frame pump that should be adequete with the proper pressure regulator,for maf, on the injector rack.If you go carb, you will have to elimenate the frame pump, and probably regulate the intake pumps with an inline regulator.If it were me building a HP engine, I would go mass air.
Phillip