I got down to 12 flat with a 80 gph Holley mechanical pump with 3/8 line with sock off and a piece of hose extending it.
Went to a Holley Blue pump dead heading it it. No real difference.
Once I put a roller cam in I ran 1/2" line with Mallory return regulator. I soldered a 1/2" steel line from the front of the tank to the bottom point. Pump is in the front of the tank and the bottom of the pump is about level with the top of the tank. Never had a issue picking up fuel. Car was running mid 11s. 60 foots in the mid 1.5s.
Then I bought a 140gph Holley knockoff pump and the car car got down in the 11.30s. Other changes were made so all of the improvements were by no means all fuel related.
Then I got a hair brained idea and thought I would try it.
Always wondered if the 140 was big enough to keep up and the 3/8" line was still there. Tank had a 1./2" line and a 3/8 line picking up fuel from just about the same location in the stock tank.
So I put my old Holley 80 gph mechanical pump back on the 3/8" line and rant it to the primaries . That pump does not require a regulator.
I have a return regulator on the 1/2" line on the other side of the car and that goes to the secondaries . So the 140 pump just by passes back to the tank unless the throttle is mashed.
Well, it worked just fine. Never had a issue with it in any way. People thought I was nuts.
That is the fuel system that was on it when the car ran its best.
10.82 @ 121 mph with 1.43 60 foot.
I will give the system another shot only with a new 110 gph pump on the primaries just for time sake.
Everything is not going my way this summer, cam issues, work issues and now a heart by pass in the family we have get through.
When we get back from that I will thrash to get the car out for the last month of the season.
I have a 5 gallon fuel cell I can put in and bought one of Langers old pumps if I have any issues delivering gas.
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