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Fuel Pump repairs

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GuyTN

Freshman Member
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All,

My BJ8 quit running about two blocks after a fuel fill-up. It appears that it is not getting fuel. My opinion is that the filter is blocked up after 95,000 miles and no cleaning. I can hear the fuel pump trying to pump, but it stops quickly (apparently after pumping up to pressure).

The fuel pump is an AUF 300 type. It appears that I must remove the Coil housing from the pump body, remove the filter, clean and replace it. I can do this without removing the whole pump by accessing it through the wheel well after removing the tire.
My question is: With a full tank of gas and the filter removed, how will I keep the gas from leaking out?

Any suggestions about the best way to do this procedure would be appreciated.

Thanks,
Guy Beaty
 
I would suggest removing the pump to work on it. Much easier than doing it in place.

First, disconnect the tank to pump line at the tank. This will prevent most of the spillage. Then remove the other pipe connections.

Before you do this, there are a couple of pump flow checks that could be done to isolate the problem. You might find that someone has added another filter inline somewhere.

When checking for flow, place a snug fitting rubber line over the connection & lead it into a catch can.

Disconnect the pump to carb connection at the carbs & check for pump flow. If the flow is good at this point, about a pint in 30 seconds, the carb inlets originally had screens which could plug. Check them.

If the flow is nil at this point, move back to the pump outlet connection & check for flow. If no flow, the pump, it's inlet screen, or the tank to pump inlet pipe has problems. Or, sometimes there is an internal screen on the pump pickup pipe in the tank which can get plugged.

Good luck,
D
 
Also note if there is any trace of a fuel tank sloshing compound. Somebody had done that to my Healey and pieces of the crap would float up and block the pick-up tube.

For a while, I carried a piece of hose in the car to give a quick blast (by mouth) into the pick-up tube to keep me going for another hundred miles.

Eventually, it either dissolved or was ingested by the engine, and gave no further trouble...
 
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