In reply to a message from Bard Th Hesvik sent Wed 28 Jun 2006:
Ah, well! The cause of my problems seems to be one of mans best
I never get the hang of how the tanks, pumps, switching and
equalizing works on these things, and how water could be present in
the left hand tank again after draining 2 gallons from it (until
only petrol ran out of the drain hole) the other day - with no rain
in between - and verifying that the left tank yielded petrol only,
I’ll never know!
I had the engine running fair on tickover, but sputtering and
mirfiring upon throttle. Cleaned the carbs thoroughly and put it
all together again (apart from the float chambers which were nicely
laid out in the passengers footwell but, it is possible to remove
and refit them with carbs in situ!)
I then made sure the ‘‘good’’ tank was selected, and tried starting.
When it still ran poorly on throttle I was about to give up! Then I
thought I’d replace the bad tank gauge in the left tank and decided
to drain it by pumping the petrol into emergency cans. I was
surprised to find the left tank was almost empty, because it had
only run a few miles since full but was used extensively while
idling. I thought I’d check out the right (water-ridden) tank, and
found it to contain half a litre of H2O again. Drained, pumped
through, and started up immediately getting a better feeling. The
engine could actually be revved!
Question: Do the tanks equalize on a Series I XJ12??
I knew I had a bad filler neck drain on the right hand side, but
never got around to giving it a proper go. Well, I did now! An
attempt to stick a nylon tubing up from below offered half an inch
penetration. Pulling the end of the hose I got another inch of it
out which showed some sort of twisting of the hose, completely
plugging it where it passed through the lower quart panel. Snip
with the siccors and a little working up and down freed the drain,
and it now works as it’s supposed to! Ten minutes work…
I’m not taking the carbs out again, just drive them clean, of
course after doing the filter. No water is ever going to get into
these carbs again!
Sorry about the longish post. I’ll reply privately next time q;-)
Bard Th Hesvik
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