Where to get separate Fuel Pressure Regulator?

[99streetranger]

Hello,
I have a 99 FFV ranger and the fuel pressure regulator has gone out. Where can I buy the right fuel pressure regulator separately without having to buy a whole new pump assembly? My pump is working just fine.

 

[franklin2]

I looked a 99 up, it seems the fuel pressure regulator is on the fuel rail in the manual I was looking at.

 

[99streetranger]

I looked a 99 up, it seems the fuel pressure regulator is on the fuel rail in the manual I was looking at.

If it is on the fuel rail would be the injector pulse damper. It attempts to create more even pressure in the fuel rails while individual injectors are firing.

 

[RonD]

1999 V6 Rangers do have the FPR in the gas tank on fuel pump assembly, its a Returnless fuel system

The 4cyl 2.5l still used the FPR on the engine with return line

In 1998-2000 V6 Rangers the FPR is on the fuel pumps output hose, not a good idea
Ford change that in 2001 by adding a 3 port fuel filter

Not sure if adding an inline FPR will work, outside of the tank
And I haven't seen this type of FPR sold separately

1998-2000 V6 assembly seen here: https://www.partsgeek.com/assets/products/fulln/JKRV41F6.jpg

The round part above the pump is the FPR, just a spring loaded valve set for 60psi(appox.)
Fuel pumps are capable of 80+psi
FPR has the white hose on the back that sends extra pressure/fuel back to bottom of the tank

Picture here of a used 1998-2000 setup: https://www.ranger-forums.com/howtos/FuelPump/FuelPump019.jpg

If your system pressure is too high, above 65psi FPR is stuck open
If pressure is too low, under 45psi then could be weak pump or failed FPR


Ford changed this system in 2001 because fuel pressure at the rail/injectors was jumping around too much
They change to a "semi-return" system, FPR still in the tank but hooked to 3rd port in fuel filter this stabilized pressure at the rail
Newer system has no connection between pump and FPR: https://m.media-amazon.com/images/I/615iOy3BtXL.jpg


Returnless systems got a Damper on the fuel rail to prevent the build up of pressure waves in the fuel rail, its just a rubber diaphragm that absorbs pressure waves so they can't reflect back off the end of the rail and build up
Vacuum hose is just a safety requirement in case it leaks

Return systems FPR on the rail did the same thing, its rubber diaphragm absorbs pressure waves but also regulates pressure, it's vacuum hose stabilized pressure using engine load/vacuum level

 

[99streetranger]

1999 V6 Rangers do have the FPR in the gas tank on fuel pump assembly, its a Returnless fuel system

The 4cyl 2.5l still used the FPR on the engine with return line

In 1998-2000 V6 Rangers the FPR is on the fuel pumps output hose, not a good idea
Ford change that in 2001 by adding a 3 port fuel filter

Not sure if adding an inline FPR will work, outside of the tank
And I haven't seen this type of FPR sold separately

1998-2000 V6 assembly seen here: https://www.partsgeek.com/assets/products/fulln/JKRV41F6.jpg

The round part above the pump is the FPR, just a spring loaded valve set for 60psi(appox.)
Fuel pumps are capable of 80+psi
FPR has the white hose on the back that sends extra pressure/fuel back to bottom of the tank

Picture here of a used 1998-2000 setup: https://www.ranger-forums.com/howtos/FuelPump/FuelPump019.jpg

If your system pressure is too high, above 65psi FPR is stuck open
If pressure is too low, under 45psi then could be weak pump or failed FPR


Ford changed this system in 2001 because fuel pressure at the rail/injectors was jumping around too much
They change to a "semi-return" system, FPR still in the tank but hooked to 3rd port in fuel filter this stabilized pressure at the rail
Newer system has no connection between pump and FPR: https://m.media-amazon.com/images/I/615iOy3BtXL.jpg


Returnless systems got a Damper on the fuel rail to prevent the build up of pressure waves in the fuel rail, its just a rubber diaphragm that absorbs pressure waves so they can't reflect back off the end of the rail and build up
Vacuum hose is just a safety requirement in case it leaks

Return systems FPR on the rail did the same thing, its rubber diaphragm absorbs pressure waves but also regulates pressure, it's vacuum hose stabilized pressure using engine load/vacuum level

I wonder if I might be able to re-spring the FPR. It is unfortunate that there isn’t a place you can buy the regulator separate. Other than the fact that I have a FF ranger, upgrading to the 01+ system in the future and running a third ethanol resistant line would be nice.

 

[99streetranger]

1999 V6 Rangers do have the FPR in the gas tank on fuel pump assembly, its a Returnless fuel system

The 4cyl 2.5l still used the FPR on the engine with return line

In 1998-2000 V6 Rangers the FPR is on the fuel pumps output hose, not a good idea
Ford change that in 2001 by adding a 3 port fuel filter

Not sure if adding an inline FPR will work, outside of the tank
And I haven't seen this type of FPR sold separately

1998-2000 V6 assembly seen here: https://www.partsgeek.com/assets/products/fulln/JKRV41F6.jpg

The round part above the pump is the FPR, just a spring loaded valve set for 60psi(appox.)
Fuel pumps are capable of 80+psi
FPR has the white hose on the back that sends extra pressure/fuel back to bottom of the tank

Picture here of a used 1998-2000 setup: https://www.ranger-forums.com/howtos/FuelPump/FuelPump019.jpg

If your system pressure is too high, above 65psi FPR is stuck open
If pressure is too low, under 45psi then could be weak pump or failed FPR


Ford changed this system in 2001 because fuel pressure at the rail/injectors was jumping around too much
They change to a "semi-return" system, FPR still in the tank but hooked to 3rd port in fuel filter this stabilized pressure at the rail
Newer system has no connection between pump and FPR: https://m.media-amazon.com/images/I/615iOy3BtXL.jpg


Returnless systems got a Damper on the fuel rail to prevent the build up of pressure waves in the fuel rail, its just a rubber diaphragm that absorbs pressure waves so they can't reflect back off the end of the rail and build up
Vacuum hose is just a safety requirement in case it leaks

Return systems FPR on the rail did the same thing, its rubber diaphragm absorbs pressure waves but also regulates pressure, it's vacuum hose stabilized pressure using engine load/vacuum level

Is there anything different between the gas VS. flex fuel in-tank assemblies themselves minus the pump motor? I do know the pump motors are different in order to be corrosion resistant. The available pump assemblies on rockauto seem to come without the pump, but there isn’t a flex fuel option. Can’t find any from Motorcraft either.

 

[RonD]

As far as I know all Rangers since 1983 have ethanol resistant fuel systems
Ethanol was added to gasoline in the 1920's to boost octane but was replaced with Leaded gas because it was cheaper
Then Leaded gas turned into a real issue to health, lol, and was phased out starting in the 1970s and was replaced with ethanol completely by 1986
(and NO, the lead in gasoline was never there to "lube the valves", using lead to boost octane was just cheaper, period, no benefit to the engine)

So I don't think that is an issue with flex fuel(FF) Rangers
Yes, same assembly as any V6 Ranger 1998-2000

Pre-2001 FF Rangers will have a fuel sensor located near the fuel filter in the frame rail, these run $650, if you can find one, its a 3 wire sensor
If it fails most replace it with an Emulator and never run E85 again

Ranger 3.0l Flex Fuel has different computer software, fuel type sensor and larger injectors from 1998-2000 than gas only
2001-2003 flex fuel used use same computer and injectors as gas only, and no fuel type sensor

 

[99streetranger]

As far as I know all Rangers since 1983 have ethanol resistant fuel systems
Ethanol was added to gasoline in the 1920's to boost octane but was replaced with Leaded gas because it was cheaper
Then Leaded gas turned into a real issue to health, lol, and was phased out starting in the 1970s and was replaced with ethanol completely by 1986
(and NO, the lead in gasoline was never there to "lube the valves", using lead to boost octane was just cheaper, period, no benefit to the engine)

So I don't think that is an issue with flex fuel(FF) Rangers
Yes, same assembly as any V6 Ranger 1998-2000

Pre-2001 FF Rangers will have a fuel sensor located near the fuel filter in the frame rail, these run $650, if you can find one, its a 3 wire sensor
If it fails most replace it with an Emulator and never run E85 again

Ranger 3.0l Flex Fuel has different computer software, fuel type sensor and larger injectors from 1998-2000 than gas only
2001-2003 flex fuel used use same computer and injectors as gas only, and no fuel type sensor

Okay nice, that clears a lot of things up. My flex fuel sensor has been working fine, it definitely ran better with the E85, and temps were a lot cooler. The engine gets a bit of spark knock running on only 87 octane which is likely because I have the coil pack with the sub-par part number that Ford listed in a TSB. I just haven’t gotten around to buying a replacement and I don’t mind using E85 for now.

Running on E85 pulls more fuel which is probably why the symptoms of the FPR started showing. I could go back to just running a mixture but I would rather fix the problems than just cover up the symptoms by mixing fuels.