Still having some issues with my car, Powerstation mentioned it could be the fuel pump failing at higher rpm. Anyway, i got a new Walbro 255 pump here ready to fit but i need to know if this is gonna affect fueling to the engine?

 

Sorry, its a P1

 

Some folk run the standard fuel reg with walbro's and have no problems,Others tend to fit the sx reg and a gauge to set the pressure to suit

 

No, I don't believe so, all it does it meet (or not in your case) the requests made on it by the ECU. Check with the mappers though!

Ns04

 

It can "Overcome" the oem reg and overfuel.

 

Does 'can' mean will ??

I guess its dependant on different models then??

So does this mean i cant run it without a remap or a FPR to suit ? I have a mechanical FPG on my honda, screwed into the fuel filter, where would i mount this guage on the scoob? i know some cars have a screw in fitting on the fuel rail.

Thanks for your input, just deciding whether to fit it or not now!!

 

I have read up on this alot recently.

It should not be a problem on the newer cars as the fuel pump is run at a reduced voltage at idle, but can be an issue on the classics.

There is a good thread on 22b.com in which Andy F. and Bob Rawle discuss the issue (search under "FSE and pressure")The final verdict was not definitive but that many standard regulators can cope with the pump and those that can't tend to go off after a few months (ie pressure increases) and this causes issues at idle but it is a safer bet than using an FSE regulator that can cause issues at WOT.

HTH

 

I fitted the walboro 255 fuel pump to my MY98 type R using the standard OE fuel pressure regulator and my car ran like a bag of $hit until it was remapped.Once the remap was done the car was as sweet as a nut.Not sure if the same applies to all types of classic but it certainly affected mine big time.Not much help i know but that was my experience

 

my 95 wrx has been fine since fitting warlboro 18mths ago,but running high boost and going for re-map in jan just to check all is ok

 

I bought the same pump for my MY00 @ 269BHP. N was told that it will make my car safer at high speeds etc but in normal running it could possibly run rich, as I was planning my remap for the new year it was recomended that I wait. N not sit at silly high speeds for long periods.

 

Its better to get a remap after a fuel pump. However i heard that its not the end of the world even if you car runs rich with the uprated fuel pump and wont cause you problems that running lean would case. All you would be doing is spending more money on petrol, and the car would also be feeling a bit sluggish .

 

From my experience for any classic with Walbro a remap is needed, new age cars have more adaptive regulators/fuel system.
JIM