1971 Jaguar XJ6

Fully Fueled – Replacing the fuel tank in a 1971 Jaguar XJ6

If you’ve been following along with the progress of the 1971 Jaguar XJ6 we have here at Bridge Classic Cars, you’ll know of the trouble that our amazing technician Dave has had with getting the car to fuel properly.

What began as a simple carb rebuild and set-up has grown into making the fuel system work (and look) just as good as the rest of this underappreciated classic. The old tank once removed looked fine from the outside, but after one look inside Dave knew he had got onto the right track. Rust. The dreaded oxide that plagues all classics but something that we here at Bridge Classic Cars are well used to dealing with and overcoming for our amazing customers.

Replacement tanks are available for this generation of XJ, but this being a very early XJ6 our technician Dave noticed some changes between the two. This is no problem thanks to Dave’s unrivalled skills. He has swapped out the supplied fittings for the return style system (for use on fuel injection cars) on the new replacement fuel tank to a returnless style need for this particular XJ6 with its wonderful set of Webers. Dave has made new plugs for the lines that are no longer needed for this beautiful classic.

Along with the new tank is a brand new set of fuel lines. Because of the rust issues that Dave found through the fuel system, it is best practice to replace the lines from front to back for the longevity of the car. Now the next step, get the new tank fitted up into place along with the new carefully made lines to begin testing to make sure that this XJ6 runs as good as it looks.

More evidence of Jaguar’s dirty fuel line!

You may have seen the blog post from last week about the fuel line problems that Dave discovered on the 1971 Jaguar XJ6. If not, here’s a link straight to it. Here are some more photos and another video to show just how bad the problem turned out to be.

Jaguar’s dirty fuel line…

Dave has been investigating the 1971 Jaguar XJ6 because it wasn’t running very well. He found that the carburettor tubes weren’t the same height as each other, and there was a new one and an old one. This is all why the carburettors couldn’t be set up. So a kit was purchased with all new ones in, the same height as each other. The choke had to be modified because the car had been changed to a manual choke in the past, whereas it’s meant to be an automatic one. Dave installed a better return spring for this. He put the car back together but the car still wasn’t right… It would only run for a limited time and it started to run badly again. After another investigation, he found that it wasn’t getting enough fuel in fast enough. It was soon realised that there was dirt in the offside fuel tank, which could be found without even getting into it properly. This car has got twin fuel tanks and both were the same. Dave has drained the fuel out of both of them, remarking that it smelt like rum! Not quite right then… There’s a video at the end of this post showing him at the start of draining the offside fuel tank.

New in, 1976 Jaguar XJ6!

New into the workshop is this 1976 Jaguar XJ6. It’s got issues with its carburettors, meaning the engine isn’t running right. Ady will be in charge of looking over this one for us, being our engine expert.