Fuel pump problem

Post by **paul72** » Fri Oct 18, 2013 2:12 pm

Ok this is a old thread but ive only just got round to changing main relay that works fuel pump and have now found out fuel pump still works with it not plugged in so i take it some idiot has wired this up to first ignition so it just keeps pumping as soon as u turn the key so has anyone got any ideas where to look first where they cud of done this

Post by **Thebusofwoe** » Fri Oct 18, 2013 2:25 pm

Jeez without tracing the loom wire for the pump back then ud struggle to find it. Does anything look like its been fiddled with by the relay connector?? Is it actually causing a problem??

Think if it where me then id get the wiring diagrams and look at each point of where the wire runs, if that makes sense lol

. It hasent had a alarm fitted in its life has it??

Post by **paul72** » Fri Oct 18, 2013 2:34 pm

Yes its got a sigma alarm on it an i took all relays off an it still keeps pumping but i cant see how as only thing that works on first turn of key is stereo but theres nothing obvious that i can see

Post by **Thebusofwoe** » Fri Oct 18, 2013 3:13 pm

Hmmm. Is the fuel pump set into the alarm via an immobiliser?? Just that if it is it could be bypassed into the alarm system!!

Post by **paul72** » Fri Oct 18, 2013 3:29 pm

Not sure but alarm wud work all the time not just on 1st turn i wud of thought

Post by **Vtecmec** » Fri Oct 18, 2013 3:39 pm

If someone has bodged it they would have done so at the relay end, so all you can do is physically trace (what should be) the live feed from the relay, check it's been snipped and find where the other end is now, and then repair and remove the(bodge) ignition feed.

Post by **paul72** » Fri Oct 18, 2013 4:17 pm

Ok i take it u mean the relay under dash or are there any other fuses or relays under bonnet

Post by **Vtecmec** » Fri Oct 18, 2013 7:51 pm

Yes, I presume that the main relay was playing up, so someone just bypassed it as a bodge.

Post by **paul72** » Sat Oct 19, 2013 10:15 am

I have found that if you remove the 2nd top fuse under bonnet which is a 15amp one and i think its for interior light it stops fuel pump is this the right one or has someone messed with it to get it to work there

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sat Oct 19, 2013 12:37 pm

Under normal circumstances, yes - that fuse also feeds the ECU IIRC and without a feed from the ECU, the fuel pump won't run (that's one of the required signals into the main relay).