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Model specific boards => Golf mk3 => Topic started by: 0191joe123 on 08 March 2009, 10:12

Title: fuel pump not primeing
Post by: 0191joe123 on 08 March 2009, 10:12

rite a just went to put sum petrol in the gti ,put petrol in went to pay and came bck and car wouldnt start engine just turning and turning and carnt here the fuel pump prime has done this a couple of times now but if i sit and turn the ignition on and of it eventualy primes and the car starts av changed the fuel pump relay and still geting this problem ..any ideas its got my head done right in :angry:

Title: Re: fuel pump not primeing
Post by: mattkh on 08 March 2009, 10:28

Hi
Try a new ignition switch.

Title: Re: fuel pump not primeing
Post by: 0191joe123 on 08 March 2009, 16:21

got 1 on mate just changed it 2 mounth ag

Title: Re: fuel pump not primeing
Post by: mattkh on 08 March 2009, 17:54

Hi
In that case, how old is the coil and what about the crank sensor.

Title: Re: fuel pump not primeing
Post by: Wayne on 08 March 2009, 18:38

If the fuel pump is not priming and you have replaced the relay then maybe you have an ECU or pump problem.

Title: Re: fuel pump not primeing
Post by: jamie16v on 08 March 2009, 19:02

Quote from: wayned on 08 March 2009, 18:38

If the fuel pump is not priming and you have replaced the relay then maybe you have an ECU or pump problem.

seconded..
test it first, bypass the ecu and put a 12v straight to the fuel pump relay, if it still happens its the pump... if it doesnt then it could be the ECU..

Title: Re: fuel pump not primeing
Post by: rubjonny on 08 March 2009, 19:39

could be a fault with ign switch or ecu relay

Title: Re: fuel pump not primeing
Post by: 0191joe123 on 08 March 2009, 20:17

hi mate it will prime eventually just need about 10mins turning ignition on an off ,av changed the fuel pump relay and ignition switch about a month ago ,havent changed the ecu relay do u think i shud try

Title: Re: fuel pump not primeing
Post by: jamie16v on 08 March 2009, 21:48

its deffo worth trying.. but i would try and diagnose the fault first...

Title: Re: fuel pump not primeing
Post by: 0191joe123 on 08 March 2009, 22:19

yeh mate av got vagcom just not the cable yet ,looks lyk its time to buy 1

Title: Re: fuel pump not primeing
Post by: jamie16v on 09 March 2009, 12:24

Quote from: 0191joe123 on 08 March 2009, 22:19

yeh mate av got vagcom just not the cable yet ,looks lyk its time to buy 1

not something you could really diagnose with vag com.. you want to get yourself a long bit of wire, take it from the +12v side of the battery, crimp a male spade connector onto it and then take out the fuel pump relay, you need to find the pin that goes direct to the fuel pump.. haynes should tell you this, if you havent got one, use a continuity tester.. 
when you have found the pin that goes directly to the fuel pump you want to push the spade connector into the pin.. if the pump runs straight away then its not the pump. if it takes a couple of tries then you probably need a new pump..

Title: Re: fuel pump not primeing
Post by: 01664gti on 09 March 2009, 12:45

get a new fuel pump relay,I think its number 30