procharged 502 fuel system
 

Putting together a fuel system for my Procharged 502 MPI. Running 7 lbs. boost, 72lb. injectors. Couple of things I have been pondering.

My pick up tube is approximately 3/8" ID. I have heard a lot of different opinions on whether that is big enough or not?

Are 3/8" NPT fittings large enough?

I am looking at ditching the stock fuel rail and going with twin extruded rails. Most of the ones I have looked at are a 5/8" ID. Pretty big when I was planning on running -6 line to them?

Talk with Smitty (arcticfriends) he has been down that road and back.

Ive been told the 3/8 pickup is fine but all the fittings should be changed. I went with 1/2 npt x 1/2 barb id and hose. Fitting on tank is 3/8 npt and i put a 3/8 npt x 1/2 barb on there.

Hey Gimme hows it going? Dropped the motor off at Champion Performance last week.

Rob ..... I upped my Pickups to 5/8" ....Ran 10 AN Hose to Aeromotive Eliminator Fuel Pumps then 10 hose to an Aeromotive Y block and then two 8 hoses up to the fuel rails ....m

Thanks I couldn't remember what size hose guys were running. I am hoping that 3/8 NPT fittings will be big enough also. I may drill them out if necessary. I was running 8 AN hose I am going to go to 10AN

Going good. Just pulled my motor and put it on the stand for the winter. Made winterizing easier haha. First thing in the spring I will do some inspecting, change pressure spring in the oil pump, adjust cam timing, and drop her back in. Hopefully that will find those pesky extra horsepowers.

We plumb them in #10 hose. If I have to use a 3/8" NPT fitting, I will use a SS fitting and drill out the pipe side to match the #10 side. By using SS, it will still be strong enough. If you bored out an aluminum fitting, it may break because it will be pretty thin.

With the correct mods, the stock fuel rail can support the power. We have used them on engines making near 1000 hp. This was a 547 ci, Brodix heads, extrude honed intake, 65 lb injectors, M3 making 9 psi.
Eddie

Thanks Eddie, You have helped me a ton with my Procharger set-up. I really appreciate it.

Eddie has a thread on making a new PU for the fuel tank and we used his method and has worked out great ... Aeromotive called for .75 PU's but Eddie said the .625 would be fine .... the larger the pu the more fuel the pump has to lift and the aeromotive doesnt suck as well has it pushes ..... ..... what are you using for ecu's? I have 2 mefi1's that worked great on my prochargers .......




http://www.offshoreonly.com/forums/s...fi-1-ecus.html


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I am using the Holley HP self tuning ECU. I am also Fabbing a pick-up like Eddie has posted. I believe going from 3/8" ID to 1/2" ID makes quite a difference.

My Datalogs showed I was getting enough fuel with the -8 line, 3/8 npt fittings, and 3/8 pick-up running 7 lbs. boost at 5200 rpm. Not sure how close I was to maxing out my fuel system so I want to go a little bigger for a safety margin while I have the engine out. I am also ditching the Cool Fuel now and returning directly to tank.

we run the stock inlet tube, no anti-siphoning valve, # 10 lines to rails, # 8 return

I am going to pull my stock Pick-up and confirm. It was about a year ago when I last measured it. I thought it was 3/8" ID. I believe Kunkels Marine is running 1000 hp through the stock Checkmate pick-up.

Motor is at Champion performance right now for a rebuild. I want to rebuild basically back to stock with upgraded head gaskets, head studs, roller rockers. The one power producing upgrade I think I will do is the cam. Of course will put the Pro-Charger back on.

My tank had an extra bung the I dropped another 3/8 pick up in and Y'ed them to the -10 fuel line. I also took a lot of Eddies tips and Arctic friends tips to make 900hp out of an iron head 502/522.....Throw in a Madera cam and Bam!! Dump the fuel back into the tank also

I am in the process of fabbing a new pick-up now .48" i.d. to match the -10 fittings I am using to plumb the system. I bought the stainless 3/8 npt fittings and bored them out per Eddies suggestion (Thanks!). Once I removed the screen of the stock Checkmate pick-up I was surprised to measure its i.d. at .32". I was running approx. 700 hp thru this pick-up.

thank god for strong efi pumps.

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Comparison of the 2 pick-ups. My new pick-up is .48".Stock Checkmate pick-up is .32".

Thanks for the fabrication tips Eddie Young !

My pleasure Hadley. We build them with a 90* fitting on top of the tube for floor clearance. Just be sure you have enough room between the top of the tank and the floor to fit that straight fitting with a 90* hose end on top of it. Great job. Let me know if I can help any further.
Eddie