Upgrading fuel system need recommendations
 

Have a 69 Nova currently with a 500hp 396 and a 750 double pumper. My current setup works for this combination but now I'm building a mild 509 that will make somewhere in the 700hp range and have a Dominator.

Currently I'm running a single Holley black pump with #10 line to a y-block sends 2 #6 lines to 2 holley regulators and then feeds the front and rear bowls of the carburetor.
Below is a sketch of the system as it is now.
As you can see, I'm looking to step into the 21st century with my fuel system.
http://i109.photobucket.com/albums/n...fuelsystem.jpg
What are your recommendations for the new motor, I'm not sure that this setup will be enough to feed it. I searched around and it seemd like the magnafuel pumps are the way to go.
Could someone give me a good pump/regulator recommendation?

Also, do any of you route your fuel system this way?

Does anyone use return lines?

Thanks in advance!

Re: Upgrading fuel system need recommendations
 

This won't be a popular answer, but it will be truthful. You have all the fuel system you need with the black pump and your combo. If you do the fuel consumption equations to calculate the pounds per hour, you will see you have enough. Most people run way more pump than needed. I have a 572 that runs S/C in my altered that uses a black pump. In fact I actually put on a Jeg's 105gal./hr. pump at the US nationals a year ago, because my pump starting getting noisy and that was all I had. There was absolutely no change in ET in S/C. What I do like aboout the smaller pumps is that they don't pull that much current. If you want to upgrade I would look at the holley HP pump. Its cost effective and rated to 950 hp. And before everyone starts the acceleration argument, yes, my fuel cell is on back and I am pumping against the G-force of acceleration.

However, if you want to upgrade, you can;t go wrong with the Magna fuel, Aeromotive A2000 or the Weldon pumps. They are the cadillacs so to speak. But, you will need to utilize a return line system to use these pumps.

One question I had on your drawing though, why two regulators? There are two outlets on a holley regulator and I run one to the front bowl and one to the rear. Just curious.

Good Luck!

Re: Upgrading fuel system need recommendations
 

I went with all Aeromotive stuff on my '70 Nova. Their fuel log/return style regulator is awesome and really cleans up the engine compartment. A 2" throttle stop fits underneith nicely. I'm currently running the A1000 pump with great results and have been 9.80's @ 136 mph. After a full season, not even a hiccup.........






Bob

Re: Upgrading fuel system need recommendations
 

Thats a good question Bob. When I got the car, it always had 2 regulators on it, so I left it alone.

Does Aeromotive have routing instructions for plumbing a return system?

Re: Upgrading fuel system need recommendations
 

Never mind, found it.

Re: Upgrading fuel system need recommendations
 

Just my opinion- The Filter should always be installed before the Pump.

Re: Upgrading fuel system need recommendations
 

after talking to Aeromotive their recommendation regarding return line/by pass regulators is unless you are making about 900+ HP , have multiple carbs or running a Nitrous system it is not necessary---one thing that does happen tho is by using a return line you are A) heating the fuel B) aerating the fuel--- because of A&B most cars in their(Aero) opinion do not need a bypass/return line---Because you have the tank in the rear in order to hav ample fuel supply I would run a -12 line to the reg --eliminate the Y and then run a -10 or at the minimum a -8 to each float bowl---as for a pump a Aeromotive/Weldon/Magnafuel will work just fine---- watch the current(Amp) draw on the pump you decide on--- stay away from Barry Grant and some of the Holleys they draw lots of Amps!!!!!

Re: Upgrading fuel system need recommendations
 

that should be 900 HP OR Nitrous OR multiple carbs not all 3--just ONE of those situations then MAYBE a return/bypass line is called for

Re: Upgrading fuel system need recommendations
 

Remember one thing ! Weldon is Guaranteed for Life and that means as long as you own it period ! Call Jim Craig @ Weldon and ask Him for a second opinion, You'll be glad you did !

Re: Upgrading fuel system need recommendations
 

Let's see a #8 about .400 dia for a .120 neddle & seat?

Re: Upgrading fuel system need recommendations
 

its all about providing an ample supply of fuel to the carb/carbs---yes it might be slightly oversized but much better than being undersized ---I realize that ya all put these humongeous pumps 300-500 gal/phour and fuel lines on and the fuel only has to get thru a 70 something to 90 something jet---but cuz of all the bends and restrictions ya put in the fuel delivery system plus having to overcome having the tank in the rear of the vehicle--- can it really hurt------think about it ya can probably do a quick burnout and run most if not the whole 1/4 with whatever fuel ya have in just the float bowls-- ya really dont need much more than a 1 gal fuel tank plus what ever is in the fuel lines to do a burn out run the 1/4 and drive back down the return road, go to the scales and go back to your pit spot and have maybe at least a 1/2 gal if not more left over---ya wanna run a -6 or -8 fine go ahead and do it---makes no difference to me whatsoever

Re: Upgrading fuel system need recommendations
 

Mario


Your system looks adequate mechanically, It’s possible that the previous guy used two regulators because he had one apart and noted how small the feed hole is in these regulators.
Electrically you need to drive the pump with an adequately sized wiring and a relay.
You can use the switch to control the relay I also would use a Holley oil pressure safety switch that way when you shut of the ignition the pump dies as well. And finally pay attention to the grounding of the pump the body and / or the chassis are not always the best way to ground things with a high amperage draw.:cool:

Re: Upgrading fuel system need recommendations
 

x2

with nothing more than a Mallory Comp 140 pump and filter plumbed off the stock, unsump fuel tank, pushing fuel through the stock 3/8" fuel line to a dead headed regulator, I made over 4000 passes in this car, running a best of 1.28 60 foot and 10.07 ET n/a at 3880 lbs. with a 700HP cast iron oval port headed 468

http://i381.photobucket.com/albums/o...8circa2005.jpg

under the hood of this car

http://i381.photobucket.com/albums/o...07pass2007.jpg

Re: Upgrading fuel system need recommendations
 

Thanks for all your input.

I think for now I will leave the fuel system as is and put the 509 in and go from there. I figure the less I change in between engine swaps, the less amount of variables I will have to deal with should a problem arise. Not to mention the car had the same setup years ago with the exception that we used 2 holley blue pumps from each sump being fed into a "Y" into the #8 supply line running up to the front and the car went 9.80's with an iron headed 454. The only difference now is a have a single black pump.

Ron, the reason for 2 regulators was just as Bill had stated, the small feed holes. Figure it was better to use a regulator for each bowl rather than split that small feed hole 2 ways.

And yes I do have a seperate relay for the fuel pump as well as all the other electronics on the car.

Eventually I was thinking of going to a setup like Bob Gonier's with the regulator on the return side.

Bob Gonier, I was wondering:

What size supply and return lines do you run? I have heard of some guys not being able to reduce the fuel pressure enough with a small return line, although they may have been using a pump that flows crazy numbers.

Where did you route the return line? On my 69' there is a hole in the rear frame for the supply line to go through where it runs over the axle.

Re: Upgrading fuel system need recommendations
 

The feed hole in the holley reg is less than .250 in diameter and has a .090 pin going through it further reducing the available flow. Always use 2 or send those regulators out and be modified for more flow or get a regulator with more flow capability. I think your system has plenty of capacity for your applications.

Re: Upgrading fuel system need recommendations
 

I'm running all -10 from the cell to the regulator and -8 for the return. I was going to run -10 for the return also, but Aeromotive said no need. The regulator after the carb seemed a bit strange, but the fuel sytem has been rock solid and I like the clean look it provides. Both my fuel lines are simply run between the frame connector and the rocker panel and come up to a pair of bulkheads coming into the trunk. Very simple and clean .







Bob

Re: Upgrading fuel system need recommendations
 

The regulator after the carb is a great system. I have a lot of D Track alky users that run that type of system. It keeps a good solid slug of no aireated (SP?) fuel to the needle and seats.