Morning all, looking for some further guidance if possible, my fuel tank has recently been pressure tested and is 100%, all lines have been double checked and replaced and are 100%, yet I seem to be gettign a smell of fuel in the boot of the car still, I can only now think that the Carbon canister is letting me down, is it possible to regenerate the carbon in these, or to buy a complete repalcement, or feasable to remove from the system completely, ?

My car is a 1980 Pre HE 5.3 V12 auto XJS

Thanks

Sayers

 

Regulations vary, but I remove that stuff, and the tank vents to atmosphere via the cap.

Look up inside the RH buttress, above the tank. There is a metal can with 3 hoses. This is part of the tank vapor separation system, and that can rots out, and the boot stinks.

The fuel pump itself, can, weep from the base where the 8mm outlet is. RARE, but I have seen that a few times over the years.

The large o/ring seal inside the filler neck spout of the tank is another vapor place, and that large hose around the 2 sections will not stop vapors.

 

Thankyou for the reply, can you tell me how I need to re pipe the system if removing the vapour seperation tank, What is the downside of removing the vapour tank ? if any ?

Thanks

 

This is from memory, as I did this to all mine 25+ years ago.

Out of the top of the tank, just below that tin can, you will see 3 spigots. Cap these spigots. I used fuel related caps, readily available at any Auto Parts Store.

I took the fuel cap, and carefully drilled a 1/64" hole in it. Mine had the Non Locking caps, so easy to do. The Locking caps may be a tad testy, but everything is doable.

I removed the charcoal canister, all the plumbing, and hoses, and capped the pipe coming from the rear of the car.

When removing the hoses that travel to the engine bay, be careful, and cap any that may be attached to a vac source. Only one that I remember.

I dont see a downside, never did, as I wanted the car as simple as I could make it. If you have Emissions testing, NOT a good idea I believe. Only you will know the legal requirements in your market.

 

Thankyou

 

If a UK model, you may not even have a carbon cannister. Also, have you renewed the rubber seals under the locking rings for the sump tank outlet and the fuel gauge sender? If you have, take a look and make sure they are knocked up to their stops. If not, renew them.