cc89formula

I got a brand new fuel pump from a friend because mines going out, and from what he tells me its a big boy, 225lph and is supposed to feed a 650hp motor @ 48psi. Now what I want to know is, will it hurt my stock injectors? Is it going to hurt my performance? anything else i need to know?

graham

Nah. Its got the capability to feed more fire, no doubt about it but it wount make the injectors explode or anything.

You might want an adjustable fuel pressure regulator though, just to make sure it doesnt spike the pressure up any.

95HellBird

make it flood easier on a hot day, then your stranded for like 2 days if you do flood it

breakmyfootoff

When going to a bigger fuel pump it's best to get a better regulator at the same time. The orifice in the stock regulator for the fuel return is too small for the bigger pumps and when the return is overwhelmed the extra pressure makes it's way to the injectors causing a rich condition. Not a drastic problem, but it can cost you a few ponies and a little fuel mileage.

cc89formula

i didnt know fuel injection would flood?

Injuneer

I think a lot of people have installed the Walbro 255 LPH pumps that Racetronix and others sell, and use the stock fuel pressure regulator. I used the stock FPR with an inline pump running in series with the stock pump, and never had a problem.

Best thing to do would be install it the new pump and measure the fuel pressure. If there's any sort of restriction in the retrun line, its going to show up at idle, as soon as you put the new pump on.

If the stock FPR is unable to alllow enough return flow to control the rail pressure at 43.5psi, your going to get increased flow through the injectors. The PCM will compensate to some extent using the long term fuel corrections. But its not a good idea to run like that. But until you check the fuel pressure at idle, you won't know whether the stock FPR is correct or not.

shoebox

Just because the pump is rated at a higher lph, it does not mean the pressure will be too high. All you have to do is monitor the pressure to be sure it is being regulated in the 41-47 psi range. Higher than 47 can cause a rich condition.

breakmyfootoff

I'm just repeating what I was told by the guys at racetronix, but then again, they sold me a 170.00 regulator when I bought a pump.

Racetronix

Regulator?

breakmyfootoff

I was told that it was best to go to an aftermarket regulator because of the additional flow of the 255 LPH in tank pump, so I got an aftermarket fuel pressure regulator at the same time I got my fuel pump.

Racetronix

Ahhh... we did not SELL you a regulator, we recommended one for adjustability. We do not carry FLT1 regulators.