[Tom Vaught]

Originally Posted by rocky

My question is should I change the #10 line from my cell to a #12. Current setup is #10 to Barry grant 5000 filter to a Magna Fuel 500 pump #10 from pump to a Magna fuel regulator from regulator #8 to Holley 1050 dominator. Car is a 79 firebird all steel 455 12.1 with #62 d port head a 630 lift roller victor intake 3800 8in stall 400 turbo and 4.10 gears. All stock suspension except for comp engineering traction bars and 10.5 30 hoosiers raidial slicks. the car best is 10.47 @ 129mph with a 1.47 sixty foot. Reason why I ask car hooks good then kind of gets lazy then once in second runs like crazy. I am shifting car around 6200 and thur traps around 6700

1) I personally have never seen a Magnafuel 500 pump run well as a "deadhead" system.

2) I would use a by-pass style regulator and run a -10 or 12 line as a return back to the tank. This will make the pump a lot happier. I also would block the return from the pump back to the tank. This way you get the full volume of the MF-500 to the carb.

3) I would make sure that I had dual 30 amp or 40 amp relays feeding the pump with a 10 gage wire from the battery to the relays and then from the relays to the pump +.

4) I would make sure that I had at least a 10 gage ground wire from the pump to the negative post of the battery (assuming that the battery is in the trunk).

More slow cars are due to issues on plumbing electric fuel pumps than you can imagine.

I would say that your issue is that the pump is having a hard time moving the fuel forward under 1st gear acceleration due to either wire size or the pump by-pass diverting fuel.

Tom Vaught

[rocky]

Tom I guess I have left a few thing out

1.I do have a #8 line by pass running out of the pump to the cell as they recommended

2. I have a painless wiring 30 amp relay mounted next to the pump

3.I have a 12 gauge wire grounding pump to the frame