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hi, i recently replaced my walbro (255 LPH) fuel pump with the same walbro fuel pump (255 LPH) in my r33 (rb25det) and my car is running a little ruff, at idle it would bounce from 800 rpm to 1100, when starting sometimes it would stall or nearly stall, and of a morning (when it is cold) it will idle anywhere between 1500 rpm - 2000 rpm!... replacing the same fuel pump shouldnt change a thing so i thought. and yes the part no. is the same (GSS342).

what could it be? any suggestions or info will be great.

cheers 4drftn

try changing the fuel filter, its in the engine bay near the plenum and costs about 30-40 bucks from nissan.

If thats not it, unfortunately you will have to open the fuel tank and have a squiz. similar thing happened to me, where the bosch 040 was installed with a hose that got eaten by the petrol and so the pressure was not getting through 100%. (despite the repco guy telling me it was submersible efi hose- bastard)

what ecu is that on? if not stock perhaps the low rev light load maps need looking at

yeah i replaced my fuel filter going back about 2 months ago... would the fuel get eaten away that quick? i know the piece of hose between the pump and the bottom part of the bracket might not as it was a bit of left over hose from when i changed my fuel filter... might have to look at that... not looking forwards to taking it back out though

my ecu is a microtech LT-8 which controls my fuel and ignition so could be it... sadly i dont have a hand set, but i should be able to take it to a performance place to get it checked out.

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