TF fuel pump

[jddevel]

When I imported my TF from the US during the restoration it has had a non standard fuel pump fitted. I wish to return it to an original- SU pump. So a picture, if available, of its location/fitting would be helpful if anyone has one please.

[Steve Simmons]

The pump is next to the right rear wheel on a TF. I don't have a photo but ran across this video that goes through the whole process of replacement.

https://www.youtube.com/watch?app=desktop&v=Axrhs9HnWIg

[jddevel]

Thank you Steve. Very helpful

[Tom Lange, MGT Repair]

As I remember, somewhere between TF1500 and TF2000, the fuel pump was moved from the more common TD position on the bulkhead, to back by the fuel tank. I don't know where your car falls, but there should be holes still visible if it was moved.

Tom Lange
MGT Repair

[jddevel]

Hi Tom, My reason for asking this question is due to a long running problem with my Carbs. Without going through the history of how I have tried to sort it- running rich, I am exploring the possibility of the fuel pump contributing. The car was returned to the UK having been extensively restored including having a pump fitted of a type that runs continuously. From when I first acquired it, all "seemed" well however although I have rebuilt the carbs twice and checked and rechecked timing having still got running problems and not being familiar with the "continuous" running type pump I`m wondering whether it is in some way related to the pressure produced by the pump and whether this has changed or deteriorated in my ownership as carburetor flooding maybe causing my issue. Carb backfire especially after over run predominantly in the rear carb. Cheers Jan

[Tom Lange, MGT Repair]

There can indeed be a pressure problem with an after-market pump - many people just get a generic pump, which may well over-power the SU carbs.

If the SU pump was originally mounted on the firewall (erly TF), it would be a low-pressure pulling pump, operating at 1.5 PSI. If the pump was originally at the rear by the tank (later TF), it is a high-pressure SU pump with a fuel pressure of about 2-4 PSI. Those numbers are less than many aftermarket pumps, so then you run the risk of too much fuel.

Also check the floats, which can lead to too much fuel if there is a hole.

Tom Lange
MGT Repair

[Duncan M]

Jan-
Overpressure to the float bowl chamber could cause fuel to get past a weak sealing float valve. If enough pressure/volume then maybe also pushing fuel out the overflow tubes. This could all result in flooding the carbs.

When the correct type fuel pump is used, and the float valves are in good shape, a not unusual cause of rich running is a fuel height set too high. Best way to set up carbs is by direct measurement of fuel height at bridge using the numbers in this publication, page 29. Then once set up, do not touch the carbs. https://www.namgar.com/images/uploads/C ... er30.1.pdf

Duncan-

[jddevel]

Thank you Duncan. Finally got round to read your contribution. Helpful.