Fuel system upgrade? 351W
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From: Pennsylvania Wilds
Fuel system upgrade? 351W
Would it be feasible, and would it make much of a difference, to take my old carbed 351 in my '85 F-250 and give it some variety of fuel injection?
Hotshot
Joined: Jul 2002
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From: Bend,OR
best/economical efi would be get a mustang mass air harness, injector harness and maf harness and then get the 5.8 efi upper/lower intake and go that route. run a mustan A9l ecu for instance.
Ford Fuel Injection has a bunch of info and has links to wiring harness's and such.
Ford Fuel Injection has a bunch of info and has links to wiring harness's and such.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Yes the pump from a donor truck would work as long as you also get the fuel tank, doesn't matter what truck either the fuel pressure regulator on the fuel rail set the pressure. I don't think an EFI swap will make a hugh difference in milage though, the vehicle gearing and tranny affect it more, you'll get bigger milage increases with an OD trany swap if you don't already have one.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
All trucks from '90 on had high pressure in tank pumps only, but before that they had low pressure units in there and a high pressure unit on the frame. The other difference was that the EFI systems had return lines so the fuel pickup assembly is different. I can't say if an EFI assembly would fit in an older tank.
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From: Pennsylvania Wilds
That's interesting.
Kind of a tangent here, but this is new territory to me, as I've always had '80's trucks...
My '95 F-150 XL doesn't have the HP pump on the frame then? The reason I ask... I have to go through a strange ritual of cycling the key a few times, praying, and cranking the engine to make it start, and I was told by a buddy who had had a Bronco of the same year that it was a weak fuel pump.
But it does the same thing on both tanks, so I presumed it was a bad high pressure pump, and the in tank low pressure pumps were fine. What are the odds that both pumps are weak, then?
Kind of a tangent here, but this is new territory to me, as I've always had '80's trucks...
My '95 F-150 XL doesn't have the HP pump on the frame then? The reason I ask... I have to go through a strange ritual of cycling the key a few times, praying, and cranking the engine to make it start, and I was told by a buddy who had had a Bronco of the same year that it was a weak fuel pump.
But it does the same thing on both tanks, so I presumed it was a bad high pressure pump, and the in tank low pressure pumps were fine. What are the odds that both pumps are weak, then?
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Your truck has high pressure pumnps only and the odds that both are weak is slim.. though not impossible. It's a better chance you have a bad FPR, a leaking injector, or a bad check valve in one of the fuel sending units(do you have the fuel transfer problem between tanks?) You should start the search by attaching a gauge to the fuel rail to see what it builds with a key cycle and if it holds pressure or not.
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From: Pennsylvania Wilds
I've fixed the relay problem three times on the previous generation trucks, didn't know if it was still an issue. If it were a leaking injector, wouldn't it be every time? Sometimes it fires as soon as I turn it over. When I first got this truck, switching to the front tank stalled it out, but after a few tries, both tanks work. I just can't use the front one until I replace the filler hose, it's got a few pinholes in it, and I don't like watering the concrete with fuel, so I've got it taped up for now, until I have time to build myself some filler brackets for my flatbed, the previous owner just ran the caps up through the rust holes in the diamond plate, so I have to reach over my wooden sides to even get to the darn things.
If it's a bad check valve, shouldn't it still only be a problem on one tank, if I don't have the fuel transfer bug?
If it's a bad check valve, shouldn't it still only be a problem on one tank, if I don't have the fuel transfer bug?
