This week I am giving some more love to the XJS by replacing thermostats and adding a fuel check valve. so I am beginning to think about next steps...

For my 92 v12 (has the 6.0 fuel delivery system) the flexible fuel lines could use some attention. The pieces that look concerning are the two crossover lines from fuel rail A to fuel rail B and also the first (last) section of hose on the fuel feed line. These three sections are of the same material and while they do not leak they appear very dry and brittle on the outside layer. Where the check valve is going on the fuel feed line, the tubing has been cut and spliced for the purpose of getting a fuel pressure reading in the past. So that is where the check valve will go. As I said, this line is brittle on the outside but holds fuel but I’m not comfortable with the outer layer. The design of the hose must rely on this layer for heat protection or abrasion protection but evidently not for sealing fluid.

I am am looking for how to have these three sections replaced, one of which I want my check valve in line.

 

Do not drive this car until these hoses have been replaced.

 

 

The hoses are press-fit onto barbed nipples.

Carefully slice off the old hoses. Make every effort to avoid damaging the nipples. If you're really careful and patient you can probably save the existing ferrules but I just cut the old ones off and install new

Anyhow, the new hose is simply pressed onto the nipples with hand pressure.

That's it.

I use a small smear of silicone (or whatever slippery stuff is closest to hand) to ease the pressing-on

New ferrules are available from various vendors




Cheers
DD

 

 

I have replaced those rail crossover hoses on a 92 XJS before and Doug and Leo are spot on with their advice. Lots of patience to cut away the old hose without damaging the barbs underneath. I was able to reuse the original ferrules. I don't know where you're located, but I have a rebuilt set of feed and return hoses for the 5.3L facelift XJS that I never used, EBC4363 and EBC4364, if you're interested. I gave up waiting on a vendor to send them back to me and they arrived a week after I had installed new hoses.

 

 

I've used the smaller. shallower ferrules to replace the deeper ferrules many times with no problems. The shallow type is readily available but I'm sure the deeper ferrules are out there somewhere as well....with a bit of looking.

You'll want 'fuel injection' rated fuel hose. It'll usually say "For fuel injection" or similar right on the hose. Beyond that, nothing exotic is needed. Most parts stores sell gates, Goodyear, or Dayco. Any of those will be fine. Avoid the Goodyear hose with the blue inner liner....if it is still even being sold. The older v12s use 5/16th inch ID hose. I suspect your '92 does as well but I can't say for sure

Cheers
DD

 

Doug has pretty well covered it but the deeper ferrules, at least here are generally available from farm equipment/ tractor type outlets.

 

Why bother with ferrules? Is there an engineering reason or something? You can get heavy-duty worm drive clamps and redo every fuel hose with that, makes for easier disassembly though not as pretty visually.

You *can* buy covers for this style of clamp but its abit much.

 

The old hoses are easy to remove by using a soldering iron to cut through the old pipe. It's very quick, and no risk of damaging the barbs. I've just done the two hoses in your first pictures (between the two injector rails) and will be tacking the others shortly.

 

It bothers me more than others but next time you have one of the push on fittings apart run your finger over the barbs. Clamping a high pressure fuel hose down on such a sharp edge is just another gamble.

 

I'm actually curious about why the ferrules are there at all - what do they do?

 

In my opinion they are just finishers. They hide the end of the hose and make things look right.

Leo

 

The idea of the ferrules is to preserve the end of the hose. If left unprotected the layers of the hoses might....probably would, eventually....deteriorate and the integrity of the connection would be lost.

I know some have not used ferrules and reported no problems, at least in the short term.

IMO, they might not be 100% essential....but I can see no compelling reason to avoid using them.

Cheers
DD

 

 

 

Try Mr Injector. https://mrinjectoruk.co.uk/

 

 

Did you try https://www.jaguarfuelinjectorservice.com

and what is the part # your looking for?

Edit:

Is it the oring listed here for less then a dollar?