FPDM on '00 Explorer?

[jinx44]

I am looking to use a 5.0 and wiring from a '00 explorer for an engine swap. 99-up uses a returnless fuel system correct? If so, I would assume they have a Fuel Pump Driver Module. Where is the FPDM located? I am planning to pull all of the electrical from the vehicle as well, so that I have everything if I decided to stay with a returnless system.

 

[jinx44]

Also, instead of starting another post, I have a question about the rear ends in explorers. I know the VSS is in the axle housing on this '00 donor. However, I have access to a '95 model explorer rearend that I would rather use. They have an ABS plug in the same position on the axle housing. Is that sensor physically interchangeable? Meaning can I put a '00 VSS sensor in the '95 housing?

 

[swetrid]

FPDM is part of the fuel pump.

 

[jinx44]

FPDM is part of the fuel pump.

Okay. So its built into the hat or something? I guess I will get the pump too so I can figure it out.

Next thing, the trans has a sensor in the same place that the VSS is on mustangs and other 4R70s. So, which one does the explorer use? The one in the trans or one in the axle housing?

 

[ranger7ltr]

Where is the driver module?

FPDM is part of the fuel pump.

I was under the impression that the 99-up returnless fuel pump ran constantly as long as the fuel pump relay supplied power and the ECM sensed engine rotation...The fuel pump doesn't vary pressure or speed unless the pump is restricted by a bad filter or garbage in the tank being pulled through the pump...At least that is case on my 1999 Explorer and another 2000 Explorer Sport I have seen...

This is a picture of the 99-2000 fuel pump and I don't remember any modules on it...

 

[windsors03cobra]

I do not know where the Driver Module is on that model year Explorer but its surely not on the hat and is more than likely near the fuel tank somewhere in the back. There is lots of wiring in the back left.
I believe the returnless does work by varying pump voltage to obtain the correct pressure. Many system even have a fuel rail pressure sensor.

FPDM acronym. I think the other fellow was thinking you meant fuel pump delivery module which is what some call the hat/hanger/sender and the related bits.
On my 03 Cobra I have fitted a Kenne Bell Boost a Pump to the
returnless injection and it will send up to 18 volts to the pump thus increasing output almost 50%. Good pumps on these Fords.

 

[ranger7ltr]

Varying voltage happened on my 03 Cobra as well...

But not on my Explorer...The power to the pump comes straight from the pump relay when the ECM turns the relay on...And the fuel pressure does not vary on the Explorer returnless system unlike the returnless systems on the Mustang, Crown Vic, and Lincoln vehicles...Also the fuel rail pressure didn't exist for the 2nd Gen Explorer either...

Lord knows I have fought the pump setup on my Explorer enough times thanks to a rusty/dirty tank and the pressure is constant on this model of Ford...

I'm sure a 3rd or 4th gen Explorer owner can describe their fuel systems and whether they vary voltage or not but it does not happen in the 1st Gen or the 2nd Gen Explorer...

 

[windsors03cobra]

I am taking a motor from a 99 for a 98 today and noticed the difference today when removing the engine from the 99. You are right there is no FRPS and has a vacuum modulated fuel pressure regulator.

 

[ranger7ltr]

Actually that is a fuel damper...

not the fuel pressure regulator...That unit is in the tank and it is not vacuum regulated...All it does is to bypass pressure back into the tank if it gets too high...

The vacuum device on the fuel rail is there to smooth out any pulsations from the injectors opening and closing...

If you are using a 99 engine in a 98 vehicle I would seriously recommend using the fuel system from the 98 on top of the 99 engine...The return line is not there and the fuel system operates at 65-72 psi instead of 30-45 psi vacuum regulating the fuel pressure before MY 1999...

 

[windsors03cobra]

Yeap using all the 98 EFI.

 

[jinx44]

So from your posts, I am gathering that this '00 works by an intank regulator holding pressure at approx 30psi?

If the ecm runs the pump constantly when needed, then I can run any type of aftermarket pump and turn it into a return system by changing rails and just allow the ecm to run the pump?

The ecm doesn't reference fuel pressure then? Just a set value for what it should be?

I had a 700+hp turbo 2v mustang with returnless so I am familiar with their systems. That's why this returnless confused me a bit. Btw, I lost the engine in that car when the FRPS blew on a WOT pull.

 

[jinx44]

Any help on the vss issue? Or should I start a new post for it?

 

[ranger7ltr]

So from your posts, I am gathering that this '00 works by an intank regulator holding pressure at approx 30psi?

If the ecm runs the pump constantly when needed, then I can run any type of aftermarket pump and turn it into a return system by changing rails and just allow the ecm to run the pump?

The ecm doesn't reference fuel pressure then? Just a set value for what it should be?

I had a 700+hp turbo 2v mustang with returnless so I am familiar with their systems. That's why this returnless confused me a bit. Btw, I lost the engine in that car when the FRPS blew on a WOT pull.

Only the pre 1999 Explorer ran a fuel pressure of 30-45 psi...From 1999-on in the 2nd Gen truck the fuel presure runs between 65-72 psi and does not vary...The ECM does not control nor does it monitor the fuel pressure; all the ECM does it to turn on the fuel pump relay and keep the pump running as long as the engine sensors feed rotation info back to the ECM..

The only real similarity between the Explorer and the other Ford vehicles with the returnless fuel systems is that they have no return lines... The Mustang, Lincolns like the LS and the Mk8, and other Ford cars like the Crown Vic use a varying voltage system to slow down or speed up the fuel pump to vary the fuel pressure...In the Explorer from 1999-2001, the fuel pump runs constantly at a set pressure and does not change...

 

[jinx44]

Thanks for the help. I have the fuel figured out. Now to start a thread about VSS/OSS. LOL