Fuel pressure Help/Question
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Fuel pressure Help/Question
Ok I have a 1993 f150 with a engine from a 1995 f250 351W... All other kinks worked out but it surges unless you on the gas and the it even seems to skip.
KOEO pressure was 40psi KOER it dropped to 30 -32psi. KOEO pressure is right dead nuts in the middle of the scale but at the lowest part of the scale when running? Fuel pump? I'm changing the filter today or tomorrow. Any help would be great... Thanks
new parts
TPS
Map
Fuel pressure regulator
Injectors
plugs
wires
distributor (complete)
KOEO pressure was 40psi KOER it dropped to 30 -32psi. KOEO pressure is right dead nuts in the middle of the scale but at the lowest part of the scale when running? Fuel pump? I'm changing the filter today or tomorrow. Any help would be great... Thanks
new parts
TPS
Map
Fuel pressure regulator
Injectors
plugs
wires
distributor (complete)
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
That part is correct.
Not sure what you mean by that. Fuel pressure should always increase towards the higher pressure under low vacuum and should never drop below the idle pressure.
Not sure what you mean by that. Fuel pressure should always increase towards the higher pressure under low vacuum and should never drop below the idle pressure.
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Is that a little clearer on what I was trying to say.... Sometimes my mind is faster then my hands... Thanks
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This thing is driving me nuts... Surging unless I'm on the accelerator... Just can't pin point the cause...
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Old thread I know but kets see if someone answers. I have a 92 f150 nite with a 351w single tank. Does this truck have dual fuel pumps?
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Fleet Owner
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No it does not. Only one in-tank high pressure fuel pump on your truck.
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so, would this same set up from the 92 with a single tank work on my 87 with a dual tank? Having issues with the front tank. If I deleted the selector pump on thr frame and and put a high pressure pump like the 92 in the rear tank and one in the front tank would it work? Would just need to figure out how to select from one tank to the other.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
so, would this same set up from the 92 with a single tank work on my 87 with a dual tank? Having issues with the front tank. If I deleted the selector pump on thr frame and and put a high pressure pump like the 92 in the rear tank and one in the front tank would it work? Would just need to figure out how to select from one tank to the other.
The tank selector switch controls which tank/FDM is selected by supplying power and the connections for the fuel sending units. There is no other valve or switch required to make it work on a dual tank truck on the 1990 and later gas engine F-series trucks.
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I have conflicting information that a 1990 and later Fuel Delivery Module (FDM) will fit the earlier ~1985-89 F-series gas engine EFI trucks. If it does that would make the swap easier I suppose. The other concern is if the fuel lines from the tanks that are using a low pressure pump are rated for the higher pressure.
The tank selector switch controls which tank/FDM is selected by supplying power and the connections for the fuel sending units. There is no other valve or switch required to make it work on a dual tank truck on the 1990 and later gas engine F-series trucks.
The tank selector switch controls which tank/FDM is selected by supplying power and the connections for the fuel sending units. There is no other valve or switch required to make it work on a dual tank truck on the 1990 and later gas engine F-series trucks.
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