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MG TD TF 1500 - Electronic Fuel Pump Woes

The TF1500 has an electronic -ve earth HP pump by the rear wheel.

When connected to power, the pump throws once and stops. If the +ve terminal is connected lightly by hand, then the mechanical impulse from this first throw causes the conection to break momentarily and the mechanism returns to rest. The +ve again makes contact and activation restarts with the pump action cycle recurring, as in a working pump.

Am I right to think some part of the electronic break circuitry has failed and the whole gizmeo has to be replaced. Or am I missing something?


Ian Bowers

Ian,

There are three types of electronic conversions for the SU pump, they are:

1/ Transistor aided.
2/ Hall effect.
3/ Optical.

Type 1/ Retains the points the other two replaces them.


To diagnose your problem we need to know which type you have.

I have checked the Burlen site for their system but cannot find any useful info.


John


J Scragg

John

Thanks for the input. There is only the electronic platform under the cap, no points. Below that is a post which passes through the coil with a larger header retained by a set screw. It was originally bought direct from Burlen as electronic, negative earth.

I agree their site is of no help and a phone call to them took me no further towards an answer.

Hence my turning to the wisdom of this group.
Ian Bowers

Ian,

I have had a closer look at the Burlen system and it appears to be a hall effect type.
In that case one of two things has happened.

1/ An electronic component has failed.
2/ Some mechanical component has come loose and blocked the system.

In the case 1/, without a circuit diagram, not much you can do.

In 2/ you can visually inspect the parts and insure that they are all correctly attached. A good test is, with a screwdriver handle to lightly tap the front of the pump after removing the cover and with power applied.

I am assuming that your pump is off the car and on a bench.

John


J Scragg

My limited knowledge of modern electronics agrees that it works by the Hall effect operating an electronic switch to break the circuit.
There is a curious 'U' shaped metal part close to the head of actuating rod. I will check if this is magnetic which would confirm suspicions.

It is on the bench and shortly, I suspect to join all the other parts on the shelf which don't work but are (emotionally) too good to throw away!
Ian Bowers

The replacement pump rattles away happily, so the old one was dead and irreparable.

And I thought electronics did away with the vagaries on old fashioned mechanical systems, repairable by the roadside.

Progress, huh!!
Ian Bowers

Ian,

Good news that you are up and running again.
I have an idea to put to you about your electronic pump issue. Could you email me at: john dot scragg at wanadoo dot fr



John
J Scragg

nd, http://www.ttalk.info/EmergencyPumpII.htm for a mod.
Bud
Bud Krueger

This thread was discussed between 14/09/2022 and 17/09/2022

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