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

 

so just cam across this as i have noticed on a couple of ocassions i have not been able to fully fill my tank.
well i assume not.
after filling it reads only 3/4 and i would have thought i need more petrol than it took.

now i see the TSB here which state there could be 2 issues.
one is replace the tank and the other is replace the sender.
now obviously being harder to get new replacement parts the question is, is there anything that one can do to get around this and fill the tank fully if it is infact not filling properly?
is there a way one can actually check and test if it is the fuel sender reading only 3/4 when the car is infact full or if it is the tank not filling beyond 3/4?
and if it is the sender do i need to remove the tank to replace the sender or is there enough room to replace it from the top? (without cutting the parcel shelf)

 

G’day Spud,

The fuel level sender is about halfway up on the rear side of the tank and is easily removable, make sure the tank quantity is quite low first.

This should be a TSB detailing how to test and calibrate the fuel level sender.

http://www.jagrepair.com/images/TSB/...%20Reading.pdf

Cheers,
Jeff.

 

From my experience, the fuel filler on the XJR can be finicky. Just another Jaguar oddity for us to get used to.

The comments by B1mcp are particularly pertinent.

I have recently completed over 2500km to outback NSW Australia with my small caravan in tow, yes, a rare sight for a Jaguar, and completed many refills.

A careful approach is required, the nozzle angle should provide adequate air escape and flow rate can impact also, plus the petrol station fuel nozzles present a problem.

Unfortunately, we have a combination of a finicky fuel filler and Petrol station nozzles that are not in good condition/adjustment. I usually have a rough idea of my fuel required when filling up and often persist past the pump clicking off.

I have noted over my 12yrs of ownership the state of the servo pump nozzles. I have had many occasions when I have had the pump repeatedly clicking off right from the start. I have subsequently given up, driven a couple of km up the road to another petrol station and filled up with not a problem. The condition/adjustment of the nozzles is very incontinent and a delight when you strike a petrol station pump/nozzle that just fills the tank completely with no issues.

John Herbert
1996 XJR

 

G'day Gents,

If, as per the TSB, one of Jaguar's recommendations for this problem is to replace the fuel tank does anyone know what the problem is with a tank that it needs replacing?
I am curious to know.

Cheers,
Jeff.

 

in this instance trying to fill after the click was not working. i just kept shutting off again.
but yeah i think you are spot on about some nozzles just being crap.

i mean this is certainly not an issue i have everytime i fill up.....
where it happened this time was a different servo to where i usually fill also.

i want to get a tow bar on my jag too.
my missus says the jag shouldn't tow.
but i have a trailer that i have nothing to tow with and the jag will do it effortlessly

 

Gday Spud,

I filled my car a couple of days ago and becuse of congestion at the servo I had to park with the driver's side next to the pump and so had to fill up with hose across the car, the nozzle was at 90 deg to the car but pointing outboard not inboard. I filled it until it clicked and it took exactly what I thought it should have but the fuel guage only read just over 3/4s full even though the numbers at fill up added up to a full tank.

Next time I started the car the fuel guage read full tank, weird and on several subsequent starts there were various readings some higher than the previous reading and some lower. This could be due to contamination on the wiper part of the fuel level sender so when my actual fuel quantity is very low I an going to remove the sender and clean things up to see if that makes any difference.

Cheers,
Jeff.

 

that might be similar to what i am seeing. will keep an eye on it