help! fuse keeps blowing

[amnash]

im in the process of my rb25 neo swap and everything is done, its just a matter of wiring and getting it to start up. the r34 engine harness is all set up to plug into the r32 chassis wiring. i cant figure out my my fuel pump fuse keeps blowing. ive gone through three 15amp and one 20amp fuses.

im completely stumped as to why it keeps blowing. it worked fine with the rb20 installed. the only part of the circuit ive tampered with is the ecu fuel pump relay wire and that's now hooked up to were the rb20 fuel pump relay wire was connected to the chassis wiring.

any ideas? anyone that's done a rb25 swap run into this problem??

[Skym]

As far as I know, when ignition fuse blows it's due to lack of earth on ignition module area (earth is not grounded). I would check earths and make sure no exposed wires are touching chassis.

[amnash]

fuel pump fuse is same as ignition?

[Xeno-Vibe]

Have you tried disconnecting the fuel pump and cranking to see if it blows?

If there is too much current flow the fuse burns to open the circuit, so its drawing too much current in your fuel pump wiring. It could be caused by the 12v feed from the fuse all the way to the pump.

It is often best to eliminate a portion of the circuit to determine where the short is taking place. Start at the fuel pump itself. If the fuse blows as soon as you turn on the key, undo the connector at the tank to the pump and put in a new fuse. Try it again, if the fuse pops then your short is before that point likely a chafed wire on the body. If the fuse stays good then the problem is in the pump harness or the fuel pump itself.

[Voodoo_ChildR32]

Sounds like a short to ground. Probly a pinched or exposed wire.


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[amnash]

i think i figured out why its not priming after measuring some voltages on the relay pins i think the ecu isnt sending the signal to ground the pump relay. i checked both the r32 wiring and r34 wiring and they are the exact same for the fuel pump. any ideas why the ecu wouldnt be sending the signal?

[amnash]

could someone take a multimeter to there car and read the voltage or resistance on the fuel pump relay pin on ecu? that would be a huge help because then i would at least know what to aim for

[amnash]

pretty sure this was because i had the fuel feed/return lines crossed. no problem since.