hey all i got a new bottom end fitted to my rst and she wont start, i have a question, when you turn the key you can hear the fuel pump priming, should you hear this everytime you turn the key?

cheers

 

Fuel pump should prime everytime key is turned mate

 

even if u prime it and then turn it off and straight back on again?

 

the guy whos fitting it says he can get the fuel up as far as the metering head but not to the injectors

 

yes it should, remove the air filter and pump the flap in the metering unit while someone primes the pump this should force the fuel to your injectors, it will take a few attempts but should work.

 

ok will try this mate thankyou

 

Mine only primed when I took the key out the barrel, if I turn the ignition on let it prime, then turn ignition off but don't take the key out, when I put the ignition back on it doesn't prime.

 

you will find it will only prime when the pressuse drops which usually takes a few secs, if your not getting fuel to the injectors then pressure will be low hence the priming every time you turn the key even if its switched back on instantly after being turned off, as said get someone to pump flap under air filter as you crank the engine

 

cheers lads i will keep you updated work will commence tomorrow!

 

totally disagree mate
fuel not getting to injectors wont make the pressure low.
and car will not prime everytime you turn the key,if you turn it first time it will prime,if your attempting to start everytime it may well prime everytime,but if your just turning the ignition on to see if you can hear it then it wont prime cos pressure is there already

 

brand new fuel pump just fitted and no other problems before bottom end change

 

turn your key off for around ten secs an then turn it back on it will prime again, every rs on mfi ive ever had has done this

 

MFI N/A always primes when the key is turned. You don't have to take it out to let it prime again. Just turn it back to 0 and turn it again. Afaik MFI Turbo don't have a fuel pressure sensor, so I'm convinced RSTs will do it the same way like XR3is do, they use the same relay.

Is the fuel pump running when the engine is cranking?