hi
Recently i install prodrive ecu in my classic, it runs fine, but i'm interested in change fuel pump
The car have 15 years,,,so my question is what's the best fuel pump option with my ecu?
Thanks

 

Walbro 255 fuel pump will do you fine.SJ.

 

But can run ok having different preassure and l/h?
Thanks a lot

 

Yes.
The fuel pressure is not regulated by the pump, but with a seperate regulator, so fuel pressure will stay the same.

 

Ok thanks!

 

But can i have problems with over preassure?..
I run with standard ppp ecu

 

No you will not have over pressure problems. The fuel pressure regulator sets the fuel pressure, not the pump. The uprated pump only has the ability to supply a higher volume of fuel, if required.

 

But the standard OE FPR is not intelligent. It is set with a specific sized opening which lets through a specific amount of fuel over a specific amount of time. So increase the pressure from the pump the same sized restriction from the FPR will increase the pressure pre FPR becuase it can't bleed away the extra fuel quickly enough.

Yes the FPR is attached to the manifold for vacuum but this just allows more or less pressure pre FPR using vacuum to open the FPR opening. This again is a specific amount based on the stock system and pressure. It is not intelligent.

Later cars I believe vary the amount of fuel the pump puts out but classics pumps are just on or off.

Although the differences with a walbro may not be enough to effect things adversely (I know people run them on stock systems) an adjustable FPR set to the stock pressure would be better surely?

Or am I missing something?

 

The only reason I can think for having an aftermarket FPR is to squeeze a little more injector capacity of standard injectors or if you're running large injectors that require more fuel than the OE FPR can provide. Certainly on my classic the pump is indeed on or off, no variable speed control or whatever. That's why there's a fuel return line.

 

All this things are my doubts,,and i don't like to have problems
Regards

 

I think this has thread got a little out of control. To the OP, get the pump and fit it. You'll be fine. Many many people have done so before you without any issues.