Re: 1976 Evinrude 15 hp 15604A Fuel pump?

[johnyrude200]

If you decide to do the rebuild, it may seem hard, but it really isn’t. I rebuild them all the time and keep old pumps for parts. The 3 parts that commonly fail are the diaphragm, gasket to fuel filter cover, and filter cover. Usually the filter cover fails due to someone overtightening that hand screw with a pair of pliers. The cover cracks. The gasket and diaphragm just dry out over time (but that takes years and years, or just sitting exposed to the elements without care).

Of course, I am still only 36 and have 20/10 vision. I can imagine manipulating those small parts is only going to get more difficult as time moves forward. If you use the two mounting screws to hold the various pieces in alignment, then you just ‘stack’ the parts in the correct order and it moves along like clockwork.

The trick is understanding which configuration your pump needs to be in for your motor, as the fuel outlet nozzle can be configured in 4 different directions depending on the motor (so make sure you remember which way your motor calls for). Always test the pump at the end by blowing through the inlet, then blowing through the outlet. You should not be able to blow air through the outlet. If you can, you did something wrong.

Pumps may work with this error, but in my experience fail randomly without warning when used this way.