I've almost got my XJS on the road. It's been at the mechanics for about six months, the panel beaters for a week, auto electricians for a day and was booked in for a roadworthy inspection last Tuesday - I showed up on time and there was no-one there. I waited half an hour, still no-one, so I gave up (found out later the A#&@hole was in Queensland). Anyway I got home had to put my lotto numbers on and I was getting low on fuel in the XJS so thought I kill 2 birds with the one stone so I headed out the road to do both. I travelled about 15kms down the road and the car died - I assumed I'd run out of fuel except the fuel warning hadn't come on.
Hitch hiked home, later got some more juice, refuelled the XJS and still no go. There was no noise from the fuel pump so I'm assuming a failure there. Finished up trailering the car home. Since then I've discovered the is no power going to the fuel pump ..... any ideas what my problem is? I had checked the inertia switch on the road and it was down (is it supposed to be?) Are there any other fuses or relays that could cause a power failure?

 

Sorry, I forgot to mention the car is a 1983 5.3 V12.

 

why dont you bridge power to the fuel pump, and see if it comes on. that way you can be sure its just a power issue and not a bad pump.


just curious. how much did the auto electrician do to your car, and what did it set you back? PM if you want. ive been redoing all my electric stuff due to faulty wiring.

 

As M90 suggested, connect power directly to the pump to rule out the switching electronics.

You have a main EFI relay and a Fuel pump relay in the trunk so it's possible there has been a problem there.

From bitter experience, fuel pumps just seem to fail all of a sudden. I had been driving my car all day. Stopped at home to pick up my camera, went back out after 10 minutes and the fuel pump was dead :-(

 

i can tell you that ive never had a fuel pump die on me when i was driving. ive had 3 pumps fail in 3 different cars and it was always the same. jump out, go inside, come back out to start the car and it wont start. with my GP, the fuel pump died and i took a hammer and beat on the tank a little bit and it it came back to life for a few days.

 

FWIW my fuel pump died on me while driving. Pulled over smashed it while my son cranked and got it started and made it home. Replaced it after that.

At the fuel pump relay ground the Orange wire. If the pump runs your ECU is the culprit. This is a common failure. You are best to have it repaired. A used ebay unit will likely have the same failure sometime when you least expect it.

AJ6 Engineering is your best bet for repairs.

 

or you could upgrade to a 16cu like Jamey, Mish, and I have done.

 

I checked and the fuel pump works with power. I had bought a new pump but checked the voltage going to the old one after I had unbolted it - zilch.
M90 the trip to the auto electrications was just for minor stuff to bring the car up to roadworthy (horn, windscreen washers, lights), intall a cd player instead of the non funtioning cassette player and to work out what all the extra switches were for. One of the previous owners liked installing gizmos and there was heaps of extra wiring and little switches every where. This may complicate sorting my current issue.

 

Does anyone know how to replace the fuel pump on a 1993 Jaguar XJS convertible 6 cyl 4.0?

 

where can I access a wiring diagram for a 5.3 V12?

 

You can find some stuff here. Jaguar electrical reference

You should purchase the JDHT.com DVD for your car. They are $25-45 depending on where you get them. Watch out for the fakes on ebay. The DVDs have everything, parts, service and electrical guides.

 

It's taken a while but the problem is fixed. It was as suggested a faulty relay first and faulty ecu second (there was still no power going to the fuel pump after the relay was replaced. The ecu was discolored and generally looked bad, bad connectors etc fortunately there was a parts car parked 10 metres away which donated a ecu - problem solved (I hope). Cars running very nicely now.

 

Does anyone know where the fuel pump relay is located on a 1993 Jaguar XJs 6 cylinder?
What color is that relay?
Frank

 

It should be in the trunk on the right hand side. There is a set of three relays and it is the one closet to the front of the car.


Really man? Mine like to see a horrible song of its people for a least a few weeks before it gives out...

 

Does anyone know the secret to wiggle the fuel tank out of a 1993 Jag XJS? What exactly do you have to undo or disconnect?
I've determined that my fuel pump is dead by putting voltage to the blue/red tracer wire and grounding the black wire coming out of the assembly on top of the tank. No pump noise or spinning heard. My fuel pump and main relays are good.
Thanks for your help,
Frank at 352-688-8199 (Florida)

 

idk if thats different for the convertible or newer cars, but in mine you have to remove all the stuff on the sides. The two metal panels have to come out and you have to get all the wiring up and out of the way to slide it out. There is foam on each side of the tank and after the wiring isn't blocking it you kind of just have to wiggle it out. Easiest pulling from the fill side first.

Putting it back in you get it lined up and push with your legs and it'll slide right in.