Thread: Walbro 255 upgrade

Running at 4 bar kinda avoids this issue entirely though.

How did you run 4 bar without an adjustable FPR? Did you buy a 4 bar FPR? If so, I'm actually real curious where you got that. I know Bosch makes plenty of them but I don't know of any that "bolt on". Do you?

your fuel pressure will go up with a walboro pump. Mine jumped 4-5psi but I was using a nismo fpr. I am not sure if it would go up more with a stock fpr. I also know my fuel pressure went up by 3psi with z32 fuel filter. I can't remember how much the fuel pressure went up when I installed a external relay on the walboro pump to increase voltage at the pump.

I'm installing a gauge tomorrow, then will install the Walbro, since I'm curious myself

Id like to know that too
you running a Z32 fuel filter aswell?

isnt the rise of FP due to the fact that the stock fuel pressure regulator is made in combination to the pressure the stock fuel pump puts out? if that is the case then if you install a high pressure fuel pump then it will increase the pressure on the stock FRP unit.

the rule of thumb has always been to always install a Fuel pressure gauge in combination with your new high pressure fuel pump so you know where you are at as far as Fuel pressure goes. and then get a fuel pressure regulator to dial in the desired fuel pressure since after market fuel pressure regulators are adjustable.

Not yet, but might be installing it before the fuel pump .

I've been trying to keep away from a z32 one, I think it might be linked to my bad mpg's haha. If it increases PSI, that might explain it. I doubt's it's anything serious though ha.



Yup, that's the best way to go about it

No. That is not how these things work.

V, keep me posted on this please (or just make sure you update this). I was planning on installing my new fuel pump this weekend, I have an Aeromotive with a gauge, but I don't have the fittings to hook it up yet. I forgot about the pressure increase with the pump alone... depending on how yours reacts will depend on if it gets done this weekend or if I will have to wait for fittings for the Aeromotive.

I would just install an inline gauge... but I don't have one of those. I bought the gauge that screws into the Aeromotive AFPR unit...

No problem, I just subscribed to this, so will be in my reminders list.

BTW get that Aeromotive on, well worth it

Yeah, I know it will be! I just need to find all of the fittings for it... I don't exactly know what they all are. Easy to find out, just hasn't been top priority yet. I really want to run 4bar fuel pressure though. BTW Vadim, I'm pretty sure I've finally figured out my AFR issues. I'll PM or text you sometime to fill you in more.