Fuel pump doesn't come on - coupe GT5e

moomin · 27-01-09, 06:08 PM

Hi have a weird problem with my audi coupe gt5e - '84

Went to start it saturday, pump didn't make the usual prime noise tried to start it to no avail, check spark, timing etc then checked for fuel, no fuel coming through

Went to gsf got a new pump for £30 stuck that on, tried again pump primed and car started to run then cut out after about 30 seconds, tried again - nothing

Fuel pump won't prime, I've checked all the fuses and cleaned all the contacts on everything I could find.

Wired in a 12v feed to the pump to check it wasn't faulty works fine.

What's stopping it priming? I don't really want to have it running from a permanent 12v feed with a switch.

Haynes manual doesn't have a wiring loom diagram and I can't find a relay that says it runs the fuel pump.

Ideas I'm stuck getting the bus to work till i can resolve this

vag80 · 27-01-09, 06:26 PM

I think you may find the relay is playing up had a look in an old haynes manual for b2 80 79-83 on page 249 wiring diagram it has a relay for fuel pump J17 no sure if this is any help as this is for 80gle

steveb · 27-01-09, 06:27 PM

Relay for the fuel pump is in the fuse box number 6 i think should be printed inside the fuse box cover

moomin · 27-01-09, 06:34 PM

Number 6 is 171919091a and comes up under searches as...

171919091A control unit for shift and consumption indicator relay location: / 3

Does it also do the fuel pump? If so I'm funked as GSF/Audi/VW/Unipart/Ebay can't match it :|

MikeNZ · 27-01-09, 08:29 PM

Yes, the fuel pump relay sounds like the culprit. It happened to a CQ i used to own. An auto electrician rebuilt the relay for not much money which cured the problem. The relay does burn out, but it can be hastened by a failing pump drawing too much current which overloads the relay so the pump replacement was probably a good idea. Also, change the fuel filter, an often neglected maintenance area in these cars. A knackered or blocked fuel filter can make the pump fail more quickly.

moomin · 27-01-09, 11:07 PM

Is it relay in postion 3 or 10 that runs the fuel pump have conflicting answers now. Bloody haynes book of lies is no use

steveb · 28-01-09, 09:33 AM

Managed to look at the fuse box now it is in position 10 ..........Relay for manifold pre heater K-jetronic diesel pre glow, is the one

Must have been relay #6 in the 200 we had a problem with the other week

moomin · 29-01-09, 07:35 PM

Relay arrived today i'll whack it in tomorrow night after work and we'll see what happens

27-01-09, 06:27 PM	#3
steveb Senior Member Classic Audi Club Member Join Date: Jul 2008 Location: West Berkshire Posts: 1,155	Relay for the fuel pump is in the fuse box number 6 i think should be printed inside the fuse box cover __________________ [FONT] '76 Leyland Princess 2200 HLS '79 Scirocco storm '84 WR '89 coupe quattro '01 A2 1.4 TDI SE '14 A3 1.4 TFSI COD [/color][/size][/font]

28-01-09, 09:33 AM	#7
steveb Senior Member Classic Audi Club Member Join Date: Jul 2008 Location: West Berkshire Posts: 1,155	Managed to look at the fuse box now it is in position 10 ..........Relay for manifold pre heater K-jetronic diesel pre glow, is the one Must have been relay #6 in the 200 we had a problem with the other week __________________ [FONT] '76 Leyland Princess 2200 HLS '79 Scirocco storm '84 WR '89 coupe quattro '01 A2 1.4 TDI SE '14 A3 1.4 TFSI COD [/color][/size][/font]

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27-01-09, 06:26 PM	#2
vag80 Senior Member Classic Audi Club Member Join Date: Oct 2008 Location: Bracknell Posts: 1,967	I think you may find the relay is playing up had a look in an old haynes manual for b2 80 79-83 on page 249 wiring diagram it has a relay for fuel pump J17 no sure if this is any help as this is for 80gle

27-01-09, 06:34 PM	#4
moomin Grown up member Join Date: Jan 2008 Location: Canterbury, Kent Posts: 98	Number 6 is 171919091a and comes up under searches as... 171919091A control unit for shift and consumption indicator relay location: / 3 Does it also do the fuel pump? If so I'm funked as GSF/Audi/VW/Unipart/Ebay can't match it :\|

27-01-09, 08:29 PM	#5
MikeNZ Grown up member Join Date: Jul 2008 Posts: 246	Yes, the fuel pump relay sounds like the culprit. It happened to a CQ i used to own. An auto electrician rebuilt the relay for not much money which cured the problem. The relay does burn out, but it can be hastened by a failing pump drawing too much current which overloads the relay so the pump replacement was probably a good idea. Also, change the fuel filter, an often neglected maintenance area in these cars. A knackered or blocked fuel filter can make the pump fail more quickly.

27-01-09, 11:07 PM	#6
moomin Grown up member Join Date: Jan 2008 Location: Canterbury, Kent Posts: 98	Is it relay in postion 3 or 10 that runs the fuel pump have conflicting answers now. Bloody haynes book of lies is no use

29-01-09, 07:35 PM	#8
moomin Grown up member Join Date: Jan 2008 Location: Canterbury, Kent Posts: 98	Relay arrived today i'll whack it in tomorrow night after work and we'll see what happens