well, heres my story abt priming pumps...many moons ago, (abt 30 yrs) i had a 107 perkins in my W32, and pumping that little lever on the built in fuel pump, was getting a lot of complaints from my tired thumb! went thru another method of bleeding... took 2 people...one to run the throttle, and me at the engine...throttle on all the way, crack the nuts on each injector, turn the engine over till fuel comes out where the nuts are lose...tighten nuts one at a time, till engine starts, and quickly pull throttle back to idle...voila...bleeding complete! after much thought, i picked up an 'ac' pump that was a feed thru also...now get them at napa...put it in the fuel line before the filter, and another voila...pump fuel into the racor 500, till there is enuf space to secure the cover, and never looked back! on my present boat (of 15 yrs) i changed it a little...i put 3 ball valves in the line, so under normal running, the fuel goes directly to the engine. when filling a filter, or bleeding the system, i close the valve in the direct line, and open the 2 vales in the line that goes thru the pump...(like a detour)...only problem is, i have to remember to change the valves bk to normal!! have had at least 5 people copy my system...one has a long wire to the pump, and can take it anywhere hes working on the fuel system...i also
carry a spare pump!...c

If you want to use your electric fuel pump as a filter then install it
before your racor. If it plugs up; your engine will come to a halt and
it might be said that you will deserve whatever happens to you.

I had a boat last fall that had just such an installation with a cheap
Napa fuel filter before the pump. The little filter would plug up every
few minutes and the engine would stop. Since we did not have many of
these spare filters, I had to reverse purge them and reinstall in order
to get the engine running. This was on a single screw boat.

Putting the pump before the racor simply means that the pump is now in
effect, the FILTER. It is only a matter of time before a glob of gunk
brings the whole show to a halt.

Do it any way you want, but when the engine stops you can't complain
that you weren't warned.

Regards,
Mike

Capt. Mike Maurice
Beaverton Oregon(Near Portland)