Small update. I managed to book a day on John's ramp to investigate the annoying fuel tank issue. I also found a spare tank in the shed! So I pitched up with the intention of simply swapping the tanks. You can just see in this pic the straight tank reataining strap and the tank curving up away from it:
Getting the tank off is fairly simple, especially on a ramp. Simply seperate the exhaust on the join behind the 'cat' and shove it out of the way. The remove the hand brake cable. Next remove the feed, return, fill and large and small breather pipes to the tank, being prepared for some spillage.
Once the tank was out, it was obvious why I couldn't fill it much over half:
Look at the top and compare it to the other tank in the background:
Behind the large filler pipe is a large diameter breather that lets the air out as you fill the tank (this is blocked off when you put the cap back on). This is welded to the inside top of the tank and is kept out of the fuel until the tank is almost totally full. As the top of the tank had been sucked down so much, this breather had been angled right down into the fuel. I'm amazed the pump was able to suck this hard and sill provide the engine with enough fuel. I have noticed no drop in performance.
Now, I obviously didn't want to simply fit the new tank only for it to be ruined, too. I checked all hoses and breathers were clear and in good condition. The only conclusion I could come to was that the pipe to the carbon cannister, or the cannister itself, has become blocked, so I've separated the pipe just after it joins and cable tied it above the tank. An earlier car without the carbon cannister would simply have this breather circle the tank at the top and it just ends, to let fumes/ expansion out, and air in when fuel is drawn out. Later on I'll extend this tube in the same way.
Amusingly, the fuel pump (which must have been having a VERY hard time!) decided to seize when I tried to re-start the car. I guess running it dry for a few seconds after sucking on the tank for months had just taken it's toll. Very kindly, John lent me his GTE Champion to get home, where I found another pump in the stores. Fitted it a few days later and it's good as gold now. The sender in the new tank works as well, which is a nice bonus!




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keep up the good work! red GTE`s are the ****!!!


