Hey gang,
Hope the day is going well for you all.

I am going (if my machinist ever quits messing with his stock car stuff) to be replacing the 560 hp 468 in my Nova with a 496 that ought to make at least 100 more hp. (I'll be ticked if it doesn't)

The fuel system as it sits consists of a Mallory Comp 140 gph pump, 1/2" lines, and a bypass style regulator that returns unused fuel to the tank. I am wondering if this setup will supply enough fuel for the new combo???

2 things to consider, is there enough total volume of fuel, and will the existing pump be able to overcome the G forces on the fuel in the lines.

We have all read a lot about this in the past.....BG fuel systems published a bunch of info.....but then they like to sell fuel pumps.

What do you think?

I chose the 140 gph pump because I believed it would do the job for what I had, and it was rated for continious street duty. Most if not all of the larger pumps probably don't like to be run all the time. The Comp 250 however will bolt right in and I'm sure I can design a circuit that will allow it to run at a lower voltage till I need it to run full tilt.

I realize that overkill is probably a good thing in the fuel delivery dept, but it's tough on the pocket book! And my VISA card is about to need an aluminum radiator with a good electric fan......can hardly keep it in the wallet these days....it's beginning to overheat!

Thanks

Ron

Ron,

A Carter 172 mechanical will supply enough Fuel.

But since you already have the 140 leave it right there, it is much more than adequate.

I ran the Carter for the last three years and had abslutely no problems in performance.

I did a test this spring using a mallory 140 pump with return regulator and there was NO Change in performance.

Thanks Tom,

I'm sure your 540 is thirstier than my baby 498 will be.
The plan is to run som 1/8 mile races to start with. I can keep an eye on the fuel pressure gauge. Still get's well into high gear even in the 1/8 mile.
Ron

Good Ron,

Keep it as Simple as you can...The more parts on your car that are simple, the more reliable and consistent it will be...Ask any succesful racer, they will tell you the same thing..

Ron, I believe your good to go with the comp 140 as is. racer1320 runs the comp 140 via the stock tank and 3/8 pickup and run's low/mid 10's ALL DAY LONG. No return line and a dead head reg to boot!!!! His combo has got to be 600hp++++.......never any fuel issues for him. I am using the same pump, sumped stock tank and 8an line the whole way, I am not making the power that Ed and you will be. I am wanting to score a gauge for the dash for two reasons...........guages are cool, and thinking that this pump would be all that is needed for a shot of the KNAWS :eek: :eek: :eek: