[Diy_efi] EFI Fuel Filters

Dan dzorde
Wed Nov 16 01:04:55 UTC 2011

I'm currently redoing the fuel lines/fittings on my '86 GM TPI system 350 chev, and something got me thinking.
I have nice 3/8" feed line and 5/16" return line with AN8 and AN6 fittings. There is then the occational metric fitting such as the TPI, fuel pump and fuel filter.
What has me wondering is the fuel filter as a possible flow constriction. The filter has M14 screw fittings with internal flare shape, yet the actual inlet/outlet hole inside the filter (in the flare taper is only 7/32" or 5.5mm ish). This is a OEM filter from an OZ Ford running 300+kw in factory form.
So I guess question is, why such small holes in the filter when fuel lines are generally much bigger, or could I have run smaller fuel lines to begin with as this is all that is needed ?
Is there a EFI filter that has?larger in/out holes, I scoured through the Ryco filter catalogue and this was the best I could come up with (that had screw fittings) ?
Thanks?? Dan
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