[Flyingpig]

This is what I did on my B model. I pull fuel with an electric pump (Airdog Raptor 150) thru the first filter (Parker Vormax) then on to the stock transfer pump, then to the stock filter head/filter and primer pump. I have a liquid filled gauge on the output side. When my filters are clean and new I get about 50-55 lbs. at idle. My mileage and power take a nose dive when pressure drops to anything below 40.

My first filter, on the Vormax, is a System One with a 35 micron screen that can be cleaned and replaced on side of the road if need be. The final filter is from the Cat store. It is now listed as an industrial filter rather than a road filter. By getting the Cat 1R-1712 you will get much longer life from your filters. I go about 2 months and write the date of change on the filter can with a Sharpie. The 1712 is a 10 micron filter media whereas the road filter is only 4 microns Four microns is too restrictive for an older engine.

Everyone in the filter business will sell the 4 micron filter because it "fits" all engines, meaning it screws onto the filter base. Ive done lots of checking and found only the Cat 1712 has the proper media restriction. If you use any other Cat filter number or ANY other brand, it will be 4 micron and restrict the flow causing you to change filters every week or more.

 

[Flyingpig]

I should also say, I put on the electric pump to "help" the stock pump. I bought a rebuilt transfer pump that did little better (30-35psi) than the one it replaced. They wouldnt give me a different one because it "was in spec," even tho the engine would not run properly. I was told that Cat pumps were good pushers but terrible suckers. I experimented with pump pressures on the electric pump and settled on 18 going to the transfer pump. This is how I end up with 50 or so after the 10 micron filter. I found that increasing pressure to 60 psi hurt mileage so I backed it off.

 

[Flyingpig]

Yes OE filters for my engine are 10 micron.

 

[Flyingpig]

That would work in a perfect world, but sometimes the electric pump just wont pull the fuel until you unscrew the hand pump and jack it a few times.