Hi Listers... I have a problem with the carbs on my Mark V Jaguar. Maybe one
of you have had the same problem on a MG.
I noticed that the car was running rich and fouling the plugs. I removed the
caps and pistons from both carbs. When I turned the ignition on, I noticed
that fuel was seeping from the jet in the front carb, and the pump kept on
clicking slowly instead of stopping. Thinking it was a bad float or a stuck
float needle, I dismantled the float chamber. The float was perfect, no gas
inside. I even checked it in a glass of water, and it "floated" perfectly. I
checked the needle valve, and it was clean. I put the lever back on, checked
the adjustment (7/16" bar across the rim of the top) and it was perfect. I
held it upright, and blew hard into the inlet while raising the arm, and it
stopped allowing air to pass through. Released it and air passed through.
Satisfied that everything looked good and was in adjustment, I reassembled the
float chamber, turned the switch and again, gas seeped up through the jet
accompanied by a slow "click...click" of the pump.
I did not remove the float chamber from the body of the carb, but, if I
remember correctly, there are no moving parts in the connection between the
float chamber and the body.
I am at a loss as to why the gas continues to seep through the jet. It seems
to me that if the float needle was seated properly in the valve body, and air
under pressure couldn't get through when the float lever was in the up
position, how could gas get through?
Note, I have new float needles and valves, the new ones with the rubber points.
The valves are tight and, as I said, don't leak under air pressure with the
lever in the up position. The only thing I did not do was to swap float tops
and see if it still leaked from the other carb jet when the tops were switched.
Any suggestions?
Craig CarraganSouthbury, CT USA
/// unsubscribe/change address requests to majordomo@autox.team.net or try
/// http://www.team.net/mailman/listinfo
/// Archives at http://www.team.net/archive/mg-t
|