Fuel Pump - douging

The fuel pump is mechanical, not electric, and runs off a camshaft in the engine block. The cam spins and moves a lever on the pump. Fuel comes in, is pumped through check valves, and up to the carb. A glass cover lets you see the condition and operation of the pump.

We did not suspect a bad fuel pump when working the kinks out of the carb. Fuel would spray out of the supply pipe on the carb. But there were air bubbles in the fuel when we cranked the engine, indicating air was leaking in and lowering our fuel pressure. It was also dirty.

I had read horror stories about removing the pump from the block. Access on the front bolt is tight. The right tools make a huge difference: small 1/2" socket on a 1/4" drive and the narrowest extensions you can find. With that setup everything lined up and it was a piece of cake removing it. One thing that annoyed me was that there is no drain on the pump for the glass cover so be prepared to spill an ounce of fuel when removing the cover.

Reinstalling is tougher as you're fighting the tension of the lever on the cam while trying to line up the bolts and not let the gasket drop.

I removed and reinstalled the pump about 4 times and can now do it in under ten minutes.

Photos

  • Fuel Pump

    Nasty oil! Bad for appearances but good for keeping corrosion away!

  • Fuel Pump

    This bolt is very hard to get to. The engine mount bracket is on the left. Access is tight. With a small 1/2” socket and thin extension is the trick. This bolt actually had a flat cut in it for a screwdriver but that wasn't necessary with 1/4" extensions.

  • Fuel Pump

    This is the condition of the fuel pump under the glass bowl cover. Rust and the remains of the cork gasket. It looks like rust but is actually the brownish-orange cork gasket. I think the pump itself is aluminum or ceramic so nothing to rust. The cork gasket failed and allowed air in, which reduced our fuel pressure and probably sent debris everywhere. The old gasket was easy to clean with a sharp pick and we were able to get a smooth surface.

  • Fuel Pump

    The fuel pump runs off this camshaft in the engine block. This cam shows some wear but feels smooth.

  • Fuel Pump

    New gasket and cleaning and the pump is working as it should.

  • Fuel Pump

    New gasket and cleaning and the pump is working as it should.