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MG TD TF 1500 - Fuel Pump failure

I was just tinkering with the engine tune prior to fitting the bodywork (TF) and I think I must have run the tank dry. The engine didn't stop but I shut it off and when I came to turn the ignition on again the pump didn't stop ticking and the fuel doesn't come thru into the sight glass/filter I fitted. Sounds like a tank drain and pump off job. Does anyone have any suggestions.

AJ
A R Jones

AJ - Is you pump mounted on the firewall or under car? Either way I would check to see if there is any fuel in the tank. If there isn't, the fix is easy. If there is fuel in the tank, I would check to see if there is an air leak on the inlet side of the pump - particularly if the pump is on the firewall, if the inlet tubing connection to the fuel pump is loose you can suck air instead of fuel, but not see any sign of a leak. Also check the screws at the base of the coil housing that hold the coil to the pump body. Loose screws here could cause an air leak, although there should also be signs of fuel leakage around the edge of the diaphragm. Cheers - Dave
David DuBois

Thanks for responding David.
It's a TF and the fuel pump is on the chassis at the back. It's been running fine for the last two weeks and I'd only just driven back into the garage following a quick test trip around the corner. I tinkered for a while, turned the ignition back on and the ticking wouldn't stop. I added about a gallon of fuel, I'm sure there's fuel in it now. I thought there might be an air lock in the pipe as the pipe falls below the tank and then rises to the pump effectively making a nice U bend in the delivery line before the pump. I cracked open the connections to the pump and fuel came out. It seems to want to pump, I have a sight glass/filter temporarily fitted before the carbs and you can see fuel pulsating at the bottom of the glass but doesn't seem to deliver. Is it possible that a split diaphragm will give the same problem? It's one of two things I've put back on the car without overhauling. The other one was a front brake cylinder. As it happens, the test drive was to make sure that the new cylinder I'd just fitted wasn't leaking!

AJ
A R Jones

AJ - A split diaphragm would result in fuel running out the vent hole at the bottom of the coil housing. More likely, you have a piece of debris trapped under the one of the check valve disks. If you will e-mail me at SUfuelpumps@donobi.net, I'll try to help you isolate the problem. Cheers - Dave
David DuBois

This thread was discussed between 11/03/2012 and 13/03/2012

MG TD TF 1500 index

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