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Discussion Starter · #1 ·
The fuel pump does not prime when the key is put into the run position.

i have power at the knock box, the ecu, and the icm.

the fuel pump relay is functional, and grounds through the knock box for the 88 16v cis-e configuration.



what would cause the knock box to not allow the fuel pump to run?

i have checked continuity between all the sensor inputs and everything checks out. I went through that part with my brother in law who is a trained mechanic, he couldn't figure it out either.


I'm currently at college i'm going to work on the car when i go home at the end of the week, and i'd like to get it running on cis-e like i originally planned because it's literally all put together it just wont start.

the trouble shooting i did with the Bentley led me to believe the knock box was bad. i replaced that and it's still not working.


additional info, the fuel pump did prime the first few times i tried to start the car, then it quit working, and i have a junk yard tachometer from a 4cyl Porsche hooked up. Other than than that the cis-e is wired into the mk1 wiring per this power supply diagram



Anyway,any input/help you can give will help me not be one of those people who starts a motor swap and never gets it finished, i really miss driving my mk1 :( and i'm looking forward to getting to enjoy a 16v for the first time.
 

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my mk1 OE fuel pump primes when cranking, no pre prime. If you have someone turn the key and go listen to the pump, does it make noise?

I have a 9a 16v swap that was running CIS basic. essentially, no knock box so only rev'd to 5000k.

Rarely, the relay would be "loose". I would take it out, clean it and put back in. then it fired.
 

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Discussion Starter · #3 ·
my mk1 OE fuel pump primes when cranking, no pre prime. If you have someone turn the key and go listen to the pump, does it make noise?

I have a 9a 16v swap that was running CIS basic. essentially, no knock box so only rev'd to 5000k.

Rarely, the relay would be "loose". I would take it out, clean it and put back in. then it fired.
well i have an update, the PO crimped/soldered then covered a ground with duct tape, the ground wire cracked all but one strand, it would pass continuity checks, most of the time...:facepalm::banghead: well i fixed that and now the fuel pump prime cycle works :eek:

check the resistance on the coil and secondary resistance is out of spec, i have new coil on order now.

Also 75-77 rabbits do not have a load reduction relay.
 
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