I thought I saw a thread dealing with this but can't find it.

I have no problem getting fuel to a little over the half tank level, but then then I can only continue at a trickle or the pump shuts off. If I wait 30sec. it will take another half gallon, but it takes over fifteen minutes to fill the tank that way.

I know there is a large vent pipe that runs from the top of the tank to the filler neck, so it doesn't seem possible that tank is pressurizing. Diagram for SC model below looks the same as NA tank.

Fuel Tank-4.0 Litre Supercharged/6.0 Litre-Unleaded-Usa - Parts For XJ Series from (V)720125 to (V)812255 (X300) | Jaguar Heritage Parts UK

 

I had the same problem on an XJ40 (which is essentially the same) some years ago.

What I found was that changing the angle of the filler in the neck helped to fill normally. What I mean is I used to hold the pump filler so that it was parallel to the line of the car front to back, rather than perpendicular to it which would be normal.

Also not inserting the filler as far as it would go, but only as far as needed to stop splashing helped.

Strange but worth a try.

 

Yes, I tried both of those yesterday. By waiting about 30 sec. I can get more in, but then it shuts off again. Holding the trigger so that the fuel is barely moving helps, but that's a boring job.

It seems to have gotten worse in the past couple of months, and a couple of years ago I didn't have a problem at all.

 

I know that nobody ever looks for TSBs that I uploaded YEARS ago but just a reminder that Jaguar addressed many of these faults.

bob gauff

 

Thanks Bob. I suppose these were in that large file download area that I have never been able to locate.

I'll get to work on it tomorrow.

 

YES -they are!

The Download Area links are through this thread in General Tech Help:

https://www.jaguarforums.com/forum/g...r-index-50609/

Files are all stored on the forum's MediaFire account and available for free download.

Graham

 

Hi, I am progressing the problem via chasing a new Rochester valve. Not successful yet, but I will get there soon. Whilst idly gazing into the fuel tank area, I realize that I don't know what the steel pipe that comes off the filler neck and goes back into the tank in front of the vapour expansion hump...actually does?
Dumb question I realize, but when I know that it has nothing to do with the abysmal refueling problem; I will sleep easier.
Many Thanks
Charlie
p.s I hope I posted this in the right place.

 

Gas is being poured in down the neck, the air in the tank (being replaced by fuel) has to be able to vent out somehow, so it travels through this tube.

 

From what I've been able to gather from reading others , some of the X300s have a anti - siphon trap in the fill neck / tube

This is different then the smaller diameter fuel nozzle spring trap door at the top of the fill neck

Mine does not have a anti - siphon trap and having one may be country law dependent

I don't think once the trapped gas pressure either positive or negative should have anything to do with filling with fuel once it has equalized

The question is how do you test for this anti - siphon feature ? I was able to feed a 1/4 inch tube to the bottom of my tank and that may or may not be a valid test

But is a cheap and easy test

The anti - siphon device if present in your car may have failed