1980 308i fuel pump issues

Just change my fuel pump, accumulator and 2 filters today, since I was loosing power followed by a loud bang from the exhaust, sign that I had barely no fuel getting to the engine.

The car ran fine for a while, it idled perfectly for 30 minutes or so, than I drove it for about 20 minutes, and all of a sudden, no power and again the loud bang from the exhaust.

Back to the garage, were we found out that the new pump, although clicking, was not pumping.

We put the old one in with exactly the same results.

We've elected to let the car sit for the night, have it cool down completely, to restart it tomorrow morning.

Is there something, somewhere within the injection system, that control the pump, or the pressure if a certain temperature is reach ?

Thanks for your help
Marc-André
1980 308 GTSi

 

Thanks Crowndog.

We've check the voltage to the pump at 10ish or so, even bypass the electrical connection by plugging the pump directly to a external battery.

The gas is new, Canadian 92 grade, premium gas.

 

Also, the car is starting regardless of temperature, cold, warm are hot.

Cold start-up is at the regular 2500 rpm, then settle to the std 1000 rpm.

It just would hold fuel pressure.