94 850 Turbo keeps blowing fuel pump relays

Post by **Carbon15** » 01 Jul 2015, 12:56

My 98 was just not worth fixing anymore so I bought a 94 Turbo wagon to transfer the replacement parts into. Fortunately I had a spare fuel pump relay as the one that came with it blew. It then blew my spare, and the one installed in the 98 in few minutes of run time. I had to jump pins one and three with a jumper wire. Is there a typical spot on this vehicle where the wiring shorts out?

Post by **misha** » 01 Jul 2015, 14:15

You have some kind of short in fuel pump wiring or your fuel pump use too much current than it should.It should blow a fuse first if that's the case.Check a fuse for fuel pump...maybe somebody put a stronger one and instead of blowing fuse,it keeps blowing relays.

Post by **Carbon15** » 05 Jul 2015, 16:28

I hard wired the relay, still got only a few minutes of run time. What tells the relay to shutdown, and does anyone know where that is?

Post by **misha** » 05 Jul 2015, 17:15

Immobiliser.
But...it will turn the car off in a 2-3 seconds....not few minutes.
I would replace fuel pump.
Blowing fuel pump relays,turning engine off after a few minutes....the symptoms are pointing to a bad fuel pump.

Post by **FLXC90** » 05 Jul 2015, 17:36

+1 on fuel pump, if it is binding, pulls too much load, that's why there is a relay in the circuit, not just a fuse. Fuse is for the signal, relay is pump power.

Post by **Carbon15** » 06 Jul 2015, 05:06

The fuel pump was replaced 2 years ago. I just bought the car but it ran great for two weeks before this started. I've been working off the other things is it needed, going to scan out the wiring next.

Post by **cn90** » 06 Jul 2015, 09:41

Make sure your fuel filter is NOT clogged.
A new fuel filter (Mann or Mahle) is cheap, info in forum.

Post by **misha** » 06 Jul 2015, 11:47

Doesn't matter if it's just 2 years old if the tank was low on fuel all the time.That said...if it was constantly driven with around 10-15l in the tank....the pump will prematurely fail in a short time.

Post by **erikv11** » 06 Jul 2015, 13:15

cn90 wrote:Make sure your fuel filter is NOT clogged.
A new fuel filter (Mann or Mahle) is cheap, info in forum.

He's probably thinking about the oil filter. Get a Bosch if you replace the fuel filter.

Post by **misha** » 06 Jul 2015, 13:18

Mahle & Mann also makes fuel filters .