Fuel Pump

[Kurt]

I am having a hard time finding a larger capacity replacement fuel pump for my 2000 ranger 2.5

This is a returnless system.

Anyone have any suggestions where I could find one?

 

[D94R]

Walbro 255 HP. Make sure its the HP unit.

Though you're going to hit a brick wall with your returnless system no matter how big of a pump you put in since your fuel pressure stays constant.

JessHwarren found that out and swapped to a return style system, many problems solved that way.

 

[Kurt]

The old 255 walboro isn't compatible with return less systems. There are cars out there making a hell of a lot more power then my mild turbo ranger is with a return less system, so I am not worried about that aspect.

Would a focus pump work? Or what about a mustang GT pump? Aren't those rated quite a bit higher then a stock 2.5 rangers pump? I'm just not sure if these newer return less pumps are as interchangeable as the older style ones.

 

[Dave R]

I was under the impression that the pumps were fairly interchangable between the two systems. I've not had a newer pump in my hands but in the pictures that I have seen they look the same.

The returnless system is technically not returnless, the regulator is in the tank on the fuel return from the fuel filter. It's a fixed pressure system though.

 

[D94R]

I was under the impression that the pumps were fairly interchangable between the two systems.

This was my impression as well. I had thought Jess had the Walbro in there before he changed to return style, I'll let him answer though if he sees this thread.

There are cars out there making a hell of a lot more power then my mild turbo ranger is with a return less system, so I am not worried about that aspect.

You are basing your worries on different platforms. Returnless systems from one vehicle to another are not the same. You will run into a point of driveability issues and making big power with the Ranger system.

 

[Kurt]

Yeah, I am starting to find out that not all returnless systems are the same. Like the mustang returnless system actually has a fuel rail pressure sensor and will modulate the pump.

But this Ranger doesn't have that kind of system.... like you guys just pointed out.

What's been confusing me, is that no manufacture offically lists the walbro 255 as a replacement. But it's apparent that people have tried it.

As far as the wall and horsepower issue, I guess I'm not to concerned because I am not trying to make this into a fast truck, just a Power Improved Daily Driver.

Another avenue I have been considering is going with the Kennebell Boost-A-Pump. I'm still kind of doing a list of pros and cons on the boost a pump vs just a pump. But it looks like a promising alternative.

 

[D94R]

What are your goals? My stock Ranger pump was fine at 15PSI on an other wise stock engine. I only upgraded to the Walbro 255 for safety reasons, then I turned the boost up.


I don't think even Walbro will say the 255 is a replacement for the Ranger. I had to buy the one for the mustang, it's the same pump.

 

[Dave R]

I don't think even Walbro will say the 255 is a replacement for the Ranger. I had to buy the one for the mustang, it's the same pump.

They don't list it for anything but Mustangs, T-birds and Crown Vic's.

Ford seems to have generally stuck to the same "Form Factor" on all of their pumps. All of the factory Ford pumps that I have pulled have been manufactured by Walbro. Even the one in my '93 Escort is the same physical size. When the one in the Escort was dying, I actually "temporarily" swapped in the old one from my Ranger. It's still working fine.

 

[Evil Ranger]

I am having a hard time finding a larger capacity replacement fuel pump for my 2000 ranger 2.5

This is a returnless system.

Anyone have any suggestions where I could find one?

You can get a focus pump 310 L or a GT40, both are a little over $100. You CAN NOT use the regular pre-returnless pumps. they are not ment for variable voltage and will die a quick death.

You can use the afore mentioned Retuenless Pumps, but you will need to have the voltage tables changed in your computer. Simple change if you are using SCT Software... if using some other software I don't know...

 

[Evil Ranger]

The returnless system is technically not returnless, the regulator is in the tank on the fuel return from the fuel filter. It's a fixed pressure system though.

Actually it is returnless. The regulator you speak of is actually a Parallel Pressure Relief Valve and it is more like a check-valve keep pressure in the fuel line when the engine is shut off so cold and hot starts. It's second function is the pressure relief in rapid deceleration situations... Bing that the Fuel pump is computer controlled at WOT the pumps voltage is increased as you are accelerating... Suddenly when you let off the throttle the pump is still at full tilt and the fuel has nowhere to go... the PPRV opens at 67 (+/- 7) PSI. So it's not really a return type system...just an overpressure relief valve.

 

[Dave R]

Hmm, I'll have to look closer at the wiring diagrams then, I was under the impression that the computer simply activated a relay like the older systems. If it actually controls volume/pressure by changing the voltage to the pump, the computer has to have some rather stout internals to shunt that much amperage. Or are they controling it by some other method that I don't know about?

What years are you talking about?

 

[Evil Ranger]

Hmm, I'll have to look closer at the wiring diagrams then, I was under the impression that the computer simply activated a relay like the older systems. If it actually controls volume/pressure by changing the voltage to the pump, the computer has to have some rather stout internals to shunt that much amperage. Or are they controling it by some other method that I don't know about?

What years are you talking about?

99+ ( I think...what ever year the returnless's started for the trucks. 99 in the mustangs) The computer controls a FPDM (Fuel Pump Driver Module.) They usually can take about 20 amps.. more than that and they requite two (like the GT40's, they run two FDPM's one for each pump. 03/04 Cobras with more than 500hp or so usually have to run a Kenny-belle Boost-A-Pump, which increases he output of the FDPM. there is also a Company that bumps up the windings in the FDPM to take more amps. I'mnot sure what the 05+'s do I have not had the chanceto tear into one...

Here's a pic of the FDPM opened up...

 

[Evil Ranger]

More on that...

It's actually kind of nice tuning with the pump set-up like that because when you datalog a run,one of the things you monitor is the duty-cycle of the fuel pump and the pressure drop across the injectors...

Once you see that the pump is at 100% You know you are just about out of fuel... you then watch the pressure drop across the injectors... Once that starts to drop off it's time for a bigger pump...

 

[Dave R]

There is a fuel pressure transducer in the system too?

Hmm, much more complicated than I had at first thought.

 

[Evil Ranger]

There is a fuel pressure transducer in the system too?

Hmm, much more complicated than I had at first thought.

Yeah.. and that's nice too because if for some reason it reads that the pressure drop is low and there is duty cycle left in the injectors it will compensate...

You know, more things to go wrong... But it's actually kinda neat.