Duckworth87

Hi guys. I've been driving my rst around fine. Parked it up in the garage a week ago, come to change a Speedo sensor today and when i put it back together to try it out, there's a clicking from the relays and fuel pump suddenly runs constantly instead of turning of after 2-3 seconds. So I change the yellow relay for one that is the exact same, and it still happens. Car runs but like a bag of shit, definitely overfuelling by the smell of it...
Any one got any ideas?

haz87

Fuel pump running constantly wont actually do anything other than circulate fuel round and round as the fact the injectors shouldnt be opening means it'll all just flow back via the return so this doesnt really tie up with overfuelling directly. Im not sure what the trigger is on the FRST prime, whether it stops due to the pressure being reached, or its just a short prime via relay. As you've swapped the relay out, i guess its gonna be check the pressure is being reached and/or trace the wiring. If pressure is the trigger, then it sounds like low pressure situation which would explain the poor performance when running

martysmartie

iTrader: (1)

What he ^^ said, the ERST's used timer relays to achieve the prime but on EFI, it's input related.

Given the problem has occurred immediately after you replaced the sensor, it's almost certain the problem lies here.

Maybe check it's fitted correctly and replace the old one if not to see if this rectifies the issue, if so the sensors the issue.

Martin

Duckworth87

Just to close this one and clear up what happened. Basically a massive wiring issue down to the old Clifford alarm that was fitted. Loads of old wiring cut out and repaired. Jobs a goodun