Fuel pressure advice
#1
Fuel pressure advice
So I have 95 percent of this swap done starts drives and runs great. I have the AC to take care of. I have the details in an old forum. My last issue is fuel pressure. Donor was a 96 explorer but I bought a return less fuel rail. The rest of the fuel system is 2001 3.0 for Ranger. So return line from the filter. Any easy ways to dial back the fuel pressure to 42 PSI? I was thinking about replacing the stock filter and possibly putting a regular and micron filter there. Just use barbed to AN fittings. Would this work? I'm in Vegas if someone has some free time. I might even pay someone to get it done.
#2
RF Veteran
iTrader: (1)
The fuel pressure regulator(FPR) on a 2001 Ranger is in the gas tank on the fuel pump assembly, its the round metal and plastic unit about 1/2 way up assembly
The 3rd hose on the filter is connected to the FPR in the tank
Picture here: https://content.instructables.com/OR...bounds&frame=1
Its the black unit 1/2 way up with the 2 hoses
FPR is set for 55-65psi
Pump is capable for 80+psi
I don't think there is any adjustment possible for the in tank FPR
A weaker spring?
Its just a spring valve that's pushed open at around 60psi, +/- 5psi
But what you could for sure do is to eliminate the FPR, connect its 2 hoses together in the tank so return fuel exits at the bottom of assembly, as shown
Then add an adjustable FPR, with return, on the frame rail and switch to a 2 port filter
So pump hose goes to FPR then out to filter
Return on FPR goes back to tank
You want the FPR outside of the gas tank because this is a non-standard setup so you won't know what the service life is, and you also may/will need to adjust it
So all the "plumbing" is there you just need to adapt it to your use
The 3rd hose on the filter is connected to the FPR in the tank
Picture here: https://content.instructables.com/OR...bounds&frame=1
Its the black unit 1/2 way up with the 2 hoses
FPR is set for 55-65psi
Pump is capable for 80+psi
I don't think there is any adjustment possible for the in tank FPR
A weaker spring?
Its just a spring valve that's pushed open at around 60psi, +/- 5psi
But what you could for sure do is to eliminate the FPR, connect its 2 hoses together in the tank so return fuel exits at the bottom of assembly, as shown
Then add an adjustable FPR, with return, on the frame rail and switch to a 2 port filter
So pump hose goes to FPR then out to filter
Return on FPR goes back to tank
You want the FPR outside of the gas tank because this is a non-standard setup so you won't know what the service life is, and you also may/will need to adjust it
So all the "plumbing" is there you just need to adapt it to your use
Last edited by RonD; 08-22-2021 at 01:18 PM.
#3
The fuel pressure regulator(FPR) on a 2001 Ranger is in the gas tank on the fuel pump assembly, its the round metal and plastic unit about 1/2 way up assembly
The 3rd hose on the filter is connected to the FPR in the tank
Picture here: https://content.instructables.com/OR...bounds&frame=1
Its the black unit 1/2 way up with the 2 hoses
FPR is set for 55-65psi
Pump is capable for 80+psi
I don't think there is any adjustment possible for the in tank FPR
A weaker spring?
Its just a spring valve that's pushed open at around 60psi, +/- 5psi
But what you could for sure do is to eliminate the FPR, connect its 2 hoses together in the tank so return fuel exits at the bottom of assembly, as shown
Then add an adjustable FPR, with return, on the frame rail and switch to a 2 port filter
So pump hose goes to FPR then out to filter
Return on FPR goes back to tank
You want the FPR outside of the gas tank because this is a non-standard setup so you won't know what the service life is, and you also may/will need to adjust it
So all the "plumbing" is there you just need to adapt it to your use
The 3rd hose on the filter is connected to the FPR in the tank
Picture here: https://content.instructables.com/OR...bounds&frame=1
Its the black unit 1/2 way up with the 2 hoses
FPR is set for 55-65psi
Pump is capable for 80+psi
I don't think there is any adjustment possible for the in tank FPR
A weaker spring?
Its just a spring valve that's pushed open at around 60psi, +/- 5psi
But what you could for sure do is to eliminate the FPR, connect its 2 hoses together in the tank so return fuel exits at the bottom of assembly, as shown
Then add an adjustable FPR, with return, on the frame rail and switch to a 2 port filter
So pump hose goes to FPR then out to filter
Return on FPR goes back to tank
You want the FPR outside of the gas tank because this is a non-standard setup so you won't know what the service life is, and you also may/will need to adjust it
So all the "plumbing" is there you just need to adapt it to your use
#4
RF Veteran
iTrader: (1)
Fuel system should work as is, might be rough startup until warm up and O2s are on line and computer can adjust the mix
You would then start to get Rich Codes because Computer is basing fuel flow thru injectors at 40psi, but it could be as high as 65psi
Rich codes are set when there is a 20% difference, and that's a 40+% difference
You might be able to use smaller injectors, you have to do the math to see how small
The computer is programmed for injector size(pounds/hour) and fuel pressure, no sensors for these, lol
So smaller injector will have same flow at 60psi as a larger injector at 40psi
There may be a chart for that, Pounds per Hour at XX pressure
You would then start to get Rich Codes because Computer is basing fuel flow thru injectors at 40psi, but it could be as high as 65psi
Rich codes are set when there is a 20% difference, and that's a 40+% difference
You might be able to use smaller injectors, you have to do the math to see how small
The computer is programmed for injector size(pounds/hour) and fuel pressure, no sensors for these, lol
So smaller injector will have same flow at 60psi as a larger injector at 40psi
There may be a chart for that, Pounds per Hour at XX pressure
#5
Fuel system should work as is, might be rough startup until warm up and O2s are on line and computer can adjust the mix
You would then start to get Rich Codes because Computer is basing fuel flow thru injectors at 40psi, but it could be as high as 65psi
Rich codes are set when there is a 20% difference, and that's a 40+% difference
You might be able to use smaller injectors, you have to do the math to see how small
The computer is programmed for injector size(pounds/hour) and fuel pressure, no sensors for these, lol
So smaller injector will have same flow at 60psi as a larger injector at 40psi
There may be a chart for that, Pounds per Hour at XX pressure
You would then start to get Rich Codes because Computer is basing fuel flow thru injectors at 40psi, but it could be as high as 65psi
Rich codes are set when there is a 20% difference, and that's a 40+% difference
You might be able to use smaller injectors, you have to do the math to see how small
The computer is programmed for injector size(pounds/hour) and fuel pressure, no sensors for these, lol
So smaller injector will have same flow at 60psi as a larger injector at 40psi
There may be a chart for that, Pounds per Hour at XX pressure
Last edited by Brandon88; 08-22-2021 at 03:10 PM.
#6
RF Veteran
iTrader: (1)
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