well i have the walbro on my 04 with no return line. i hope thats not bad lol. we don't have a return line thoughi dont think

 

you don't need a return line the only time you would need a return is if you want too control the feul presure

 

thanks for the replys i was just wondering if that would hurt it cause if i put that fuel pump pushing alot more fuel i didnt know where it would go unless it just broke something else like my injectors or something. Would that not be pushing alot of pressure or would it just send what is needed?

 

well the PCM is programmed for the stock pump which is a lot smaller than the walbro 255, so the PCM will think that it is sending the same amount of fuel, but in reality it will be sending quite a bit more, so yes you might need a return line, with a Fuel pressure reg. because under heavy load... lets say you flooring it for w/e reason, youcould end up blowing one of the fuel lines, or possibly damaging one of the injectors. If you think about it your trying to put a lot more fuel into a space where the volume does not change, so you will be increasing your fuel pressure dramatically, which unless you are running a turbo with a return line, FPR, and an A/F controller. among other things, but thats just my thought on it. personally i would not be willing to risk blowing one of my fuel lines or screwing up the injectors. In spikey's case i think that maybe he is either lucky or i could be wrong, but it also depends on what mods you have on your car. if its 100% stock you could be looking at much worse fuel economy, among the previously stated problems. but either way good luck with it, let me know how it turns out.

 

izero,
....there is no way too increase the feul pressure if you have the stock feul pressure regulator hooked up so YOU WON'T RUN RICH

The walboro has potentail too flow more but if the motor does notrequire more fuel, it wont give more since its being regulated. The feul pump only job is too keep the pressure at 58psi. Sounless you ad bigger injecters or the change the pulse width of the injecter it cant run rich at 58psi

 

i see, thanks for clearifying... i guess i can go tell my mechanic to go f$%# himself....

 

yea my a/f havent changed at all since i put the new pump in unless my wb is lying to me