Hi, Golf Mk1 GTi EG engine. Problem with fuel pump relay. If I fit the new relay that I recently purchased (Topran 103 420) - no sign of life. Pump does not run when engine cranking and engine does not start. When I fit a number 18 relay the pump runs as soon as ignition switched on and engine fires up and car runs fine. Pump runs continuously when ignition on. Have checked the fuse box wiring. The position numbered 1 feeds back to the coil negative The position numbered 87 feeds back to the fuel pump The position numbered 30 is a permanent 12v. As the 18 relay works fine I am assuming that the 12v ignition switched and earth are connected and ok. When I put 12v across the Topran relay it clicks on when the positive is connected to pin 31 and earth to pin 15 but does not work the other way round. Do I have a Topran possibly with the incorrect polarity or have I got a duff one? Any assistance very much appreciated.
You say 18 relay so I assume its a later CE1 fusebox then? your test confirms the 30, 15/86, 31/85 and 87 feeds are all fine in the relay socket. If your rev counter works fine then we know the wire from coil to fusebox is ok (assuming no bodgery to bypass fusebox) so that means either the tach signal isnt getting to the relay terminal (fusebox damage) or the relay you have purchesed is bad
Hi Thanks again Its looking very much as though I have been provided with the wrong relay. Looked through a site by cabby owners which set out all the relays with pictures of the connections and numbers. There one which coincides with mine is for a much later 1.8 This may explain why none of the relay connections mate up with the correct slots on the fuse box. Help very much appreciated
right so you have the CE1 fusebox, and the correct relay is the top one which is later type with large main 30 & 87 terminals. The lower relay with fuse built in is for early ceramic type fusebox. So we know the main terminals are all good becuase 18 relay powers the pump, so that leaves spin 5 on fuel relay socket which should see a rev counter feed from the coil. The thing is this fusebox is not what a 1980 MK1 1.6 should have so someone has been in there and swapped the looms over, next check would be to look at the engine and dash looms to make sure nothing has been messed with on the rev counter wire. You should have a red/black wire from the coil negative to D/26 on the fusebox, then a wire from B/19 to the cluster. Or it could just be a bad relay, these are the main relays you will see for mk1/2 kjet 8v: (VW relay number, VW part number, kraker part number, GSF part number) 2 = 443906059A/321906059D/E = no limiter (superceeded by 321906059F) 3 = 443906059 = no limiter (superceeded by 321906059E/F) 62 = 443907385B/321906059G / 24.1400.30 & 3.300.220 = 6.5k limiter 63 = 321906059F / 24.1400.20 / 935VG0090 = no limiter
Should also have mentioned that I did a continuity test from the coil negative to the fuse box slots. The coil negative connects to the slot marked 7 on the fuse box and the one marked 5 The rev counter works absolutely fine but will double check the wiring to D26 and B19 as you suggest.
I also rigged the relay to the fuse box with a home made loom Connected the large spades 87 and 30 to slots 3 and 2 Connected pin 31 on the relay to slot 4 (the switched 12v) and pin 15 to the earth. When ignition switched on relay clicks into life but engine did not start. Pump not running where engine cranked. Connected pin 1 on the relay to slot 7 on the fuse box - no difference Ran a wire from the relay direct to the coil negative but still no joy. Looks more and more like a duff relay. The one I have is a Topran and is the second duff one of theirs that `i have had. Any other make I cloud use? Thanks
Hi, Have checked the wiring to the fuse box as you suggested. B19 has a red/black wire - rev counter which works ok. D26 has a red/black wire that runs back to the coil negative. Ran a continuity test which was fine. Coil negative shows 11.58volts when the engine is running. So what I have at the fuse box seems to be: Slot 3 runs to the fuel pump Slot 2 is the 12v permanent live Slot 7 is the connection to the coil negative Slot 4 is the 12v ignition switched Slot 1 is the negative The problem with the relay is that for some reason the 12v switched and negative are reversed and the relay will not work? Am coming to the conclusion that the relay is defective. The first one I had from this source was duff and the current one is a replacement from the same outlet. They possible have a bad batch. Again thanks for your input. Very much appreciated.
Hmm that doesnt sound right, slot 7 is a cranking live feed used by some diesel glow plug relays? possibly you pushed your test probe/wire in too far? the kjet fuel relay doesnt use this pin regardless try to get kraker make relays if you can, they supply relays to VW. either that or genuine, but those will be pricey. See my list above for kraker & VW part numbers for the 62 or 63 relay you can feed into ebay
Thanks for that I have been and checked my fuse box and find that Slot 5 connects to fuse box socket pin D26 The D26 plug wire is the red and black to the coil negative. I bridged the 12v and pump connections, fired the engine up and there was 11.58 volts at slot 5. Am going to try a good relay I really appreciate your assistance Thank you again
