I think i may have posted this in the wrong forum, i'm a corvette guy, so yeah. Not sure if this is considered an "XJ12" or not.

Hi, my dad has a 1992 Jaguar XJS V12 and last winter after storage, the car did not seem to start up at all. We've come to the conclusion it was most likely the fuel pump. If i may ask, where is the fuel pump located at, and what would be the easiest way to replace it? Should i do it myself or bring it to a dealer to do. My dad believe we have to get in the trunk and pretty much pull forward and drop the fuel tank to get to it, is that true?

Also additional problems, has anyone ever had a problem with the radio not working, what would be the problem for that? the clock works on it and the other commands, and the door handle doesnt work on the driver side door but that is something that needs the door taken apart.
The car was bought pretty much new 10 years ago with only 30xxx miles on it, with no real problems, these were the only ones really ever to hit it.
Thank you!
PS: Is there anywhere to get like a shop manual for decent price and not 100 dollars off ebay?

 

Bump

 

The cars been in storage and we are just getting back around to it, I know that the problem shouldn't have been out off this long but still looking for help/info

 

First thing I'd check is to find out if the relays are working. The fuel pump is in the trunk and I don't believe you need to pull the tank to get to it. Pull back the carpeting and you should see it.

 

I think the pump *is* in the tank. I didn't that wold be the case on a '92 but, according to the info in Section 25 of this guide, it is.

http://www.captainjaguarscathouse.co...ec%20Guide.pdf

Donald, if you have a test light or meter the circuit can be checked easily.

Cheers
DD

 

Actually Ebay is a pretty good source for repair/shop manuals and $100 for a paper version is all that bad. Sometimes used ones come along from much less

An alternative is the DVD versions for about $40 or so:

Jaguar Heritage. DVD

Some of the Jaguar parts vendors have, or can get, these DVDs for you. Content varies but many of them include tech bulletins and parts catalogs as well

Radio: have you checked the fuse?

Cheers
DD

 

Yep, it's in the tank. And if the car is a convertible, the tank has to come pretty much all the way out to get at it.

As others have said, check the feed to it, and, as the battery is in the trunk anyway, just direct connect it to the battery to see if it runs.

If you turn on the ignition with the trunk lid open, you should hear the pump whir for 2 seconds then stop.

Radio is probably a fuse...... download the electrical diagrams here....... http://www.captainjaguarscathouse.co...ec%20Guide.pdf

The radio (assuming it's the stock unit) has 12v constant power for the clock and station memory, and accessory switched power for operation. Fuse number 7, 10A in the left hand fuse box, which is under the dash on the drivers side (on a US car)

 

Yep, it's in the tank. And it may not be the pump afterall. I replaced mine, but the problem wasn't the pump, it was the connector in the tank flange cover that the wires burnt up. If you download Kirby's book, there's a section on modifiing the flange and eliminating the connector. Here's the post from when I did mine:

https://www.jaguarforums.com/forum/x...pump-id-76255/

howlinowl

 

Alright, so I pretty much tore the entire console apart (cringe) looking for an inline fuse as the regular fuse for the radio was fine and intact.
Now with the radio, the security light blinks when connected, but just no display or anything at all, just the blinking light. I also found another radio connector(like a large gauge wire with a pin) in the console, unsure what that was, plugged it into the radio but no difference at all.

With the fuel pump, took your advice and some other advice found from googling around, and decided to directly connect it to the battery with test leads and who would have guessed, it's runs now. When taking my multimeter to the connections, I was getting practically no voltage, so my assumption is that the fuel pump relay is the problem. Which makes me wonder if that was the problem that caused this car to sit for 3 years with us pondering what was wrong and never getting to it. We tried putting a small amount of gas in, assuming that it had none, and the oil is also low. Put some starter fluid on the air intake and the engine seems to be fine as its turning over for a second. Bit the car just isn't running.

So what advice could you guys offer as the car sat for a while and just isn't running. I have the fuel pump directly connected to the battery when trying to start it, put some starter fluid on both air intakes, but its just not fully connecting, just turning for a second because of the starter fluid, could there be no fuel in the lines or clogged lines?
Any advice I would appreciate greatly.

Oh and is there any EASY way to get to the fuel
Pump relay, it's mounted on this metal backing on the rear trunk wheel well plate. There's a picture on this website that shows the location. (See attached link) And is this a relay that I'll have to go to jaguar for or can I go to a local auto parts store? I would call but they're closed already and I haven't removed it being afraid I wouldn't be able to put it back in for the time being.

Attached link: http://www.justanswer.com/jaguar/3p8...run-reset.html

 

To add, the oil I believe is low, just checked and its on E. so we'll have to get oil, but I read somewhere else that the computer won't deliver fuel to the engine if the oil is low, is that true?

 

"....seems to be fine..." is vague. Do you mean it's almost starting?

If so then, yes, it sounds like you have a fuel delivery issue....or there is some very stale/contaminated fuel in the lines that won't ignite





Yes.

First check the filter. It might be clogged. Empty the contents into a clean jar. What you see will determine your next steps




At a glance it looks like a garden variety relay but it isn't.

The typical auto/accessory relay has terminal designations of 30-85-86-87-87a.

You need one with terminal designations of 30-85-86-87-87.

A regular auto parts store might be able to order one for you but isn't lkely to have on sitting on the shelf.

You might have buy it from a Jag/Brit car/foreign car specialist. Lots of choices on the web. Or, as you say, the local Jag dealer.

Cheers
DD

 

You mean nothing is showing on the dipstick? If so, it doesn't necessarily mean there isn't any oil. It just means there isn't enough to register on the dipstick. Add one quart at a time until it show on the stick

Nope!


Cheers
DD

 

Doug, I believe it's almost starting, with the starting fluid it seems to be almost starting so it doesn't seem to be an engine issue. So most likely fuel delivery like you stated or old fuel/stale in the lines. Any ideal where the fuel filter is located/how to properly empty it? I'm not a car wizard, but I know quite some. This not being an area of expertise, I'm better with electrical aspects.

I'll definitely remove the relay tomorrow and drive to my local auto parts warehouse and see what they can do, hopefully order one in if its readily accessible!

There's only a tad bit on the dipstick, and its on the "E" marked on it, so nowhere close to "F".
And alright, I'll have to check the fuel in the lines but ill still put oil in the car.
Thank you so much so far!!

 

The fuel filter is located under the car, in front of the left rear wheel and inboard a little. It's about the size of a soup can. You want to relieve the fuel pressure, assuming you have any, before disconnecting the fuel filter.

This can be done by removing the fuel pump relay then cranking the engine to relieve the pressure. Sounds like you need to remove the relay anyway if you're going to replace it. Another method to relieve fuel pressure is to lift up the inertia switch - it's a black button on a small box in the cabin, right side, just in front of the right hand door door - then crank the engine to relieve pressure.

Use a pan or something under the filter when you remove it; there will be some spillage.

Many decent auto part shops will have a suitable replacement. But like Doug said, pour the contents of the filter out into a bowl or something and examine how it looks.

 

So I bought a new relay, put it in and no change at all, the fuel pump was still not running when turning the key which made me question the connections to the relay, but I jumped the relay connections and boom, it ran. So that must mean that the ignition Line to power the relay to switch isn't working, right? Since I've done some work in electronics, so it's not switching the line over.
Does anyone had any ideal what could be the culprit for that? Whether it be a fuse with ignition or cut wire or something.
So I assume I didn't need this new relay, should have just tested the old one but oh well. I'm going to for now find the fuel filter, and hopefully that Is just clogged causing the problem of fuel delivery

 

Hello Donalds5,
After a quick skim of your posts, did you find the answer for your radio problem?
I have a "92 XJS and have had the same problem. At first it was fine after punching in the security code numbers found in your manual. Then after storage, my husband jumped it as they tend to drain a battery if just sitting. I was thinking the inline fuse which I " think" may be in the rear or trunk area. Wasn't sure how old your post is? New to this. Sort of...

 

Hello Donalds5,

I have exactly the same problem (pump run only when I jump the relay and even if i force the pump to run the cars does not start) did you found the culprit?