Thanks Charlie

Gene,
A filter goes before the AND after the pump. The one before filters larger debris, to protect the pump while minimizing flow loss into the pump.  That one is often like a very fine screen.  The one after filters out smaller particulates that can cause problems in the carburetor.


Lawrenceville, GA

Hi Charlie, I'm trying to work out your reasoning for a filter AFTER the pump rather than before it. Is the pump subject to emitting debris? If so, I see the logic by not placing a partial restriction before the pump. If not, why not put the filter BEFORE the pump and keep as much contaminant as possible from wearing the pump?

The filter before the pump can be more of a screen, 100 micron, that prevents "big" particulates from getting through.  After the pump should be the fine filter, 10 micron.


Lawrenceville, GA

Chuck, the filter before the pump protects the electric pump from tank debris.

  Vic Correnti

Make sure gas tank and line are clean.

Vic, I replaced the tank when I redid the car so I put a filter after the electric pump and another bigger one after the mechanical pump up front. My old tank was full of sugar sand from sitting in El Paso for many years.

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

My 2 cents would be to have a filter before the electric pump.

  Vic Correnti

Back when I was running the McCullouch supercharger I had a problem with fuel starvation in 2nd gear. I installed an inline pump back at the tank with a switch on the dash. Even with the Holley 427 HiPo pump I couldn't get through the quarter mile without the auxiliary  pump. With the 4-71 its still in place and I leave it on all the time now. Works for me.


Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

close to the tank,have a switch so you can use the electric pump  only after car sits for a day or longer,like previous combat yes a filter won't hurt. i have installed several on 6volt  cars,2 on birds that want to stay 6volt, and has original holley garb,swell a55merk,did not use a additional filter.