GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: vw_golf_nutter on 16 April 2015, 15:27
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Hi all,
my 1989 gti 16v has a problem with the fuel pump. when you turn the key the pump starts but it doesnt go off, it stays on constantly when the ignition is on. Sometimes the car starts fine and other times it doesnt start and runs the battery out. Also the car stalled the other day sitting in the carpark and i noticed when it stalled the pump was still whirring away..
It isnt supposed to stay on permanently is it?!
And where do i start? Will it cause damage for it to stay on like that? Will it be over fuelling?
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Almost certain it should prime then stop, then fuel when the engine is running, and stop when the engine stops running. First place I'd look is at the relay.
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My limited knowledge tells me it won't be over fuelling. The fuel will just go in a circle from feed, through the fuel rail and back out the return.
I too would start with the relay.
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This car is fast becoming Triggers broom :grin:
check your relays first then check for fuel leaks.
check lift pump is working (you might not have one).
Have a new filter handy.
I bought genuine bosch pump for kjet two weeks ago for £70.
relays are about £11+vat
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it is a safety feature that the pump cuts out in 1-2 seconds in case of an accident. stops fuel getting pumped everywhere if there is a burst pipe. of course the engine is going to die if a pipe bursts so then the pump should stop to. it should work fine as is but I would check it out as said above.
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Another thing to think about... Have you got an immobiliser fitted? If your immobiliser is having issues then this would affect the fueling too. Just putting it out there!
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ok so this may be connected then... it does have an immobiliser i think as there is a little slot in the centre console for a fob which is on the keys but it doesnt work as far as i know because i dont ever put the fob in the slot and the car starts....
how do i know if there is a lift pump?
this car is not triggers broom, its a curse, a massive curse and this is payback for all the good vws i have sold because i was bored!!
i will check the relay soon as i get the car back from the bodyshop... again :rolleyes:
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it is a safety feature that the pump cuts out in 1-2 seconds in case of an accident. stops fuel getting pumped everywhere if there is a burst pipe. of course the engine is going to die if a pipe bursts so then the pump should stop to. it should work fine as is but I would check it out as said above.
Interesting. When my fuel line burst it fed the fire for a lot longer than 2 seconds. As far as I could tell it was feeding until I turned the key off. I hadn't even thought about that until now.
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If there is a lift pump, if you go into your boot and lift the carpet up you should see the top of it or at least a round metal plate with some wires going down to the lift pump. If you disconnect the pump from under the car, as in temporarily pull the wires, turn on ignition and listen you should hear the lift pump prime, if you don't hear anything it could be a contributing factor. However it doesn't explain the fuel pump constantly priming? I'd be more inclined to be looking at the electrics of the car, first relay, then the dodgy immobiliser.
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if the car runs good then its unlikely the lift pump at fault. I would be having a look at the relay/fuse box first.
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the car isnt running particularly well to be honest.
it doesnt always start, i have to turn the car for a couple of seconds, switch it off, prime the pump, turn again for a few minutes, turn it off, prime again... this goes on for about 8 times before it will start, doesnt seem to be getting the fuel through. also it is having trouble idling.
I spoke to the old owner, he said he replaced the fuel pump under the car for a recon one as the old one was split and leaking. He said he noticed the one in the tank would click sometimes and so it could be that. Also the car seems to start quicker when there is more fuel in the tank...
Im going to have a good look tomorrow when i get it back from the garage. If i need a relay how will i know if its that thats wrong? and is it this one?
http://www.ebay.co.uk/itm/no-167-RELAY-VW-Golf-MK2-POLO-MK4-Fuel-Pump-Relay-Genuine-OEM-191-906-383-C-/371017348219?pt=LH_DefaultDomain_3&hash=item56625b747b
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this is the state of my fuse box :angry:
(http://img.photobucket.com/albums/v679/vw_golf_nutter/Mobile%20Uploads/20150424_120159_zpsk4w0cqmb.jpg) (http://smg.photobucket.com/user/vw_golf_nutter/media/Mobile%20Uploads/20150424_120159_zpsk4w0cqmb.jpg.html)
the relay for fuel pump should be 167 and be in slot 2, so in slot 2 we have....
(http://img.photobucket.com/albums/v679/vw_golf_nutter/Mobile%20Uploads/20150424_124400_zpsjfpeuyni.jpg) (http://smg.photobucket.com/user/vw_golf_nutter/media/Mobile%20Uploads/20150424_124400_zpsjfpeuyni.jpg.html)
absolutely nothing!! so i think to myself how on earth is the car starting and running without a fuel pump relay... so im going to trace to wires and see whats going on, but without having done that i have a sneaking suspicion that these may be the wires to the fuel pump...
(http://img.photobucket.com/albums/v679/vw_golf_nutter/Mobile%20Uploads/20150424_174507_zps4rjbnfc3.jpg) (http://smg.photobucket.com/user/vw_golf_nutter/media/Mobile%20Uploads/20150424_174507_zps4rjbnfc3.jpg.html)
perhaps that blue relay is for the aftermarket alarm and it was all bodged up with the fuel pump wiring?
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its quite possible that yellow wire from battery is to do with the pumps wiring. but what I would try first is remove a wire from the blue relay (any wire will do) then put your ignition on. if the pump doesn't run then your one step closer. when some people do wiring repairs they shy away from getting right into the guts of the loom to trace a fault and repair it properly. instead they just add a few new wires to by-pass the problem. (we are all guilty of that at some point in our life though :embarrassed: :whistle:) as for the in-tank pump. I would replace that as soon as. they are only £20ish so its cheap insurance before it damages the main(more expensive pump).
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ok thank you. tomorrow i will go and take a wire out the relay and see what happens!
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The running better with more fuel definitely sounds like a lift pump problem to me. When Mine went the car broke down with just under half a tank, as soon as I got home and facing downhill it started first time.