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View Full Version : Fuel pump wont stop priming and engine cranking problem (New Fully Built SR20)


midnight_rex
04-23-2010, 06:23 PM
i recently am trying to get my car running after a full build on my s13 sr20. im using 740cc injectors, ISIS FPR, and walbro fuel pump and a haltech Platinum sport 1000. im using a base map from steveshadows trying to get my engine started.

problem:
when i try to prime the fuel system, the fuel pump would not shut back off. i was trying to figure out why it would not shut off. after cranking the engine a few times the fuel pump decides to switch off like normal. i thought everything was ok.

i try to turn the motor over again and it stays back on. problem did not go away.

now, here is the weird part. i never encountered something like this before. i turn the key to the on position to let the pump prime again and all of a sudden i can here a clicking noise coming from the driver side fuse block. it constantly keeps clicking on and off, making the fuel pump turn on and off also. i know there is a seperate fuel pump relay in that area of the fuse box somewhere.

there are 3 relays on the fuse box itself. 2 blue ones and 1 black one. one of the blue relays keeps clicking. i know the fuel pump relay is connected to the M4 plug in the kick panel but thats not where the clicking is coming from. i can feel it clicking from that relay on the fuse block.

could this be a ignition relay of some sort cause the fuel pump to not click off? maybe the relay is bad? i havent switched out for a good one but i will tonight.

PROBLEM #2:

as i was cranking the motor over for a dry start to prime the oil system, the starter seemed to be very weak or was having a hard time cranking the motor over. i took the spark plugs out of the motor and starter had no problems cranking the motor. i even turned the motor over by hand and it felt smooth like butter. so i put the plugs back in and the starter still was having a hard time turning the motor over. i noticed my battery going low so i switched it out for a fully charged one. cranked the motor again with same results. the starter is brand new from mishimoto. should i dry start the motor some more?

greenman100
04-23-2010, 06:58 PM
as i was cranking the motor over for a dry start to prime the oil system, the starter seemed to be very weak or was having a hard time cranking the motor over. i took the spark plugs out of the motor and starter had no problems cranking the motor. i even turned the motor over by hand and it felt smooth like butter. so i put the plugs back in and the starter still was having a hard time turning the motor over. i noticed my battery going low so i switched it out for a fully charged one. cranked the motor again with same results. the starter is brand new from mishimoto. should i dry start the motor some more?

Bad ground or bad connection on battery or starter.

Fuel pump prime time is a setting in Main Setup --> Fuel tab. If its not shutting off after that time, you have a wiring problem.