Thursday, May 19, 2011

Fuel Pump and Coils-On-Plug Kit

I dropped an E30 318is fuel pump in the tank and wired it up. The fuel pump fits nicely, uses the same range of resistance for the fuel level gauge and was engineered to work perfectly with the M42, so it's a good choice with one disadvantage; it's just a little short. This means that it leaves a gallon or so of gas in the bottom of the tank. I will probably re-engineer a, external pump solution later, but, for now, I'm happy with this pump's simplicity.

I'll have to tidy up the wiring and mount the fuel filter back there, but it's close to being done.

I received an M42 Coil-On-Plug kit int eh mail today. The stock E30 318is uses four individual coils, one per cylinder, that are mounted in the fender. Spark plug wires originally ran from each coil to a boot on each plug. Since the replacement cost for a set of OEM wires cost around $175, some innovative soul designed a mounting plate and hardware solution that utilizes coils from another BMW, negating the need for spark plug wires. The kit costs less than a new set of wires.

First, mounting studs replace the center valve cover bolts.

Then the mounting plate goes on.

Then the coils get bolted in place. The coils are Bremi 11860 units, for anyone playing at home.

The great part about this kit is that no custom wiring was necessary; it's just plug and play.

EDIT: The above wiring is not correct. In order to ensure proper spark plug wiring, one needs to do a continuity test per the following:

Coil 1 = Pin 25 at the ECU plug
Coil 2 = Pin 52 at the ECU plug
Coil 3 = Pin 24 at the ECU plug
Coil 4 = Pin 51 at the ECU plug

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