Fuel Problems

[super_s13]

Hey guys i am having some probs with my skyline. It is a r32 with a rb25det. It has a walbro 255lph fuel pump and a malpassi regulator But when it comes onto boost it cuts out and coughs and splutters then all of a sudden comes on hard. Then will surge a bit through the gears. Checked the fuel pump changes the sock on it and the fuel filter today but no joy.

Any suggestions?

[GTRNUR]

Is the malpassi the black one (2:1 ratio), or is it a 1:1 rate reg.

Was the ecu tuned with that regulator, or did you fit it just recently?

When was the last time it all ran properly, and what has been changed since?

The 2:1 regulators make the transition onto boost a little tricky to tune, and if youve adjusted the regulator just a little it will throw the tune out completely.

[super_s13]

Hey mate thanks for the reply.

It is the old type is a bog silver one. I am changing it tomorrow to a sard one to see if that helps at all.

The computer is stock. Running 8psi made 185.5rwkw. The tuner said that the fuel pump is dropping voltage and at idle the pressure deminishes and then the car idles rough then stalls. Sometime the car wont even idle. Just wants to stall all the time.

Ran fime today but my mate borrowed the car and ran it really low on fuel fuel light etc. That is why i changes the filter and the sock on the fuel pump cos i thought it may have unsettled some shit from the tank. But this did not help.

Cheers again for you help

[super_s13]

oh and nothing has been changes the only thing that happened was running it low on fuel I then took the pump out and changes the sock the fuel filter and made sure it was all nice and tight no loose hoses.

[super_s13]

all sorted was getting 8.2 volts to the ffuel pump.

Ran a seperate line with a circuit breaker and a relay now getting full 12.6 volts.

Car is running sweet again