I am not very familiar with the Series 2.

it looks like some kind of Solenoid, and at least the picture taken from the bottom looks like it is missing a hose connection.
Have you looked around for a disconnected hose?

I doubt the "fuel dump during accident" story, I have a Series 3 and I never heard of such. Ignore it.

A fuel cutoff device would affect the fuel pump's electrical circuit, but not the liquid fuel as such, in
other words, the car would not start if the safety switch was ON.

I would stop the car, remove the device, and take it to the nearest Jaguar Dealership's Parts Dept., along with
the year and V.I.N. of the car.

Surely it must be deffective and all it takes is to replace it. There is no shortage of parts for these cars so you can
find another.

As to the shop Manual, the Haynes manuals are a joke, cancel the order if you can. Order the Jaguar Factory Shop and
Parts Manual CD from the JDHT, (Jaguar Daimler Heritage Trust). If you had the Factory Manual, the part would be shown
and listed with part number. Order it in the following link:

http://www.jdht.com

XJ for two

 

ok mate am going to have a educated guess that it is the tank pressure control valve or Rochester valve as try also call it ,don't ask me what it does because i don't know,,hope this helps

 

I asked a friend who is refurbishing a Series 2 XJ-6 and he says that is a Smog Solenoid used to purge vapor/gases from the Charcoal Canister. No liquid fuel should be circulating through it, only fuel vapor.

he sent me a picture of his. It's the same as yours.

 

Series 2s and 3s had a fuel cut off switch, intertia operated. In the event of a crash, heavy impact or jolt, it switches off the fuel pump. On UK RHD cars, it's located under the dashboard, near the top door hinge on the front passenger door pillar, and has a reset button on top.

 

sounds like possibly its been plumbed in wrong.

Ive seen it happen on much newer cars, where the breather for the tank (connected to a purge solenoid, as pictured here), is incorrectly plumbed into the bottom of the tank, instead of the breather at the top.

If there is some issue (its stuck open for example), then, after a period of time on high vacuum , it coul dbe starting to suck fuel into the inlet...

i would double check all your fuel pipes, and try and get a block diagram of the system to understand, literally, all the ins and outs of the fuel delivery system. Then, once its all plumbed in correctly, you can work out if the solenoid is at fault or not.

 

Thanks for the replies, chaps. I eventually worked it out. The device is the anti-run-on valve. It's a UK car so it doesn't have all the US-spec emissions control stuff, but the same valve does form part of the emissions system on US cars.

Having bitten the bullet and taken the carbs off, all became clear. The fundamental problem turned out to be a punctured float in the rear carb. The float chamber was flooding and the excess fuel was flowing down the overflow pipe and out of the anti-run-on valve. The valve itself is working correctly.

I've now replaced the float and the car runs fine, with no leaks!

Cheers,

Chris.

 

Cheers for the update, always good to hear of a happy ending!