Fuel Pump

The E36 M3 Evo engine requires a fuel pump with a 5bar output and the standard e30 item is only 3 bar. Fortunately it's possible to fit the 5 bar unit in place of the standard pump.

Here is a photo of the E36 M3 pump (left) and the E30 item (right, this is actually an E30 M3 item).


And after a bit of measuring, cutting, soldering and general fiddling, you end up with one of these.

This first attempt failed fairly quickly, the rubber tube at the top joining the pump to the housing split under the 5 bar pressure, but luckily I was still at home testing. So it was quickly fixed with some fuel line I had.......

Here is a photo of what happens when you don't use the correct 'in-tank' fuel line!! (and means a ride home with the AA breakdown....)


The E30 M3 pump is slightly different to that in the standard E30 so I had to make up a new housing/pump assembly, and after learning the hard way how not to do it, I hope my newest creation will be fault free.

In order to stop the pump from slipping out of position and possibly disconnecting I kept the original solid metal return line which would give me something to strap the pump to. I had to modify the metal base plate as the pump wouldn't fit otherwise. I used a small piece of the original rubber to stop any vibrations from the pump making an annoying noise against the metal.


More vibration prevention. A length of in-tank hose cut lengthways and wrapped around the return pipe.


Job done.