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Help Me Troubleshoot? Fuel Pump Not Getting Power

decoyslikecurves
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decoyslikecurves Enthusiast

decoyslikecurves

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Hey all,

I just swapped in an rb20det from an r32 skyline into my ex-rb25de c33 laurel. I had the car wired up by a workshop on the goldcoast who do this sort of thing all the time, and they tested the fuel and spark when I picked it up - all was working.

I got home, put in the radiator, filled up fluids (clutch/GB/drained motor - refilled etc), drilled some holes for the standard Side mount intercooler (just using it for the moment while I iron out any kinks), fitted intercooler and then grounded places on the loom.

I went to try and start the car, but the battery was a little flat and all I got was clicking relays - so then I hooked it up to another car and tryed to jump it - the motor was turning over and over nice and freely but was not firing. First in the troubleshooting list was fuel, so I removed the input line that goes from the filter to the fuel rail (correct one) and of course - no fuel.

I then realised I didn't hear the factory pump prime when I turned the key to "on" during starting attempts, so I bust out the multimeter and measured the power line to the fuel pump (supposeably the white one with pink/purple stripe) while a friend switched car to "on" and even tried to start it. NO POWER to the fuel pump.

Now i have to find out what has changed - first guess was a relay or fuse - so I checked all the fuses under dash and in bonnet. All were fine.

Next I played around with some of the relays under bonnet and in dash - seemed to be working okay so far. I can't really tell which is for the fuel pump though - if anyone knows this can they let me know?

The other thing I checked was if the green relays next to the computer where okay by swapping them with the ones out of my r32 halfcut. It seemed to make no difference. Using the multimeter to check the wires to the green relays, one of them was getting a really weak signal when cars ignition was on.

So far thats about as far as I have got - pretty clueless where to go from here.... Can anyone give me a hand?

decoyslikecurves Enthusiast

decoyslikecurves

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Posted

I'll be honest with you - theres some scary lookin electronics in there - I'm not so super with this sort of stuff - I really wish I could just whip something up like that but I really have no experience with it...

Thankyou for the link though - if it has to come to it, I'll get an auto electrician to come and do it for me!

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