[spectramitch]

I want to upgrade all of my fuel lines on my 462 Pontiac in my 69 Lemans. Currently its 12-1 compression running on 110 race fuel. I have a Pro Systems 1100 dominator. My filter is a Mallory 500 and fuel pump is a Mallory 250 with a Mallory 4200 Regulator at the carb. The 250 pump doesn't use a return line from the regulator it comes right off of the pump into the fuel cell. The lines I am replacing are all -8 size and I haven't noticed any issues.

I want my new lines to be capable of more horsepower and possibly E85 down the road. PTFE hose and fittings is definitely the go to but my question is what sizes should I use? Some say -12 from tank to filter to pump then -10 to regulator.

[chuckies76ta]

I'm running 789hp 505 cu in with a 1050 Dominator. My lines are -10 supply and -08 return. I'm using the Aeromative A1000 pump. 100 micron filter before pump and 10 micron at the carb. To me -8 is lots if you have the pump to supply the volume. Try find out with -8 lines what the pump is rated for with Carb (naturally aspirated) They usually rate them H.P. I believe. Mine is rated to 1500 hp.
https://documents.holley.com/29269.pdf Says it must have a return line to fuel tank. Ok, I see where it comes right off the pump back to the fuel tank.

Ya after reading, a -10 would be good for future growth. Only thing I would be concerned about is, can the pump handle a -10 line to supply the carb.

[chuckies76ta]

Here is a little info from Screaming cheif. He use to be on this form. Very knowledge guy in my opinion. What HP you running?
https://www.yellowbullet.com/threads...upport.148488/

https://www.forums.maxperformanceinc...d.php?t=732983

[Johnny406]

My 463 running e85 I have -12 from the fuel cell sump to the pre-filter at the pump. From the pump, 1/2" aluminum line to the regulator. The filter inlet is slightly lower than the sump so gravity greatly assists my setup. Are you running a fuel cell/sump or are you drawing through a pickup?

[mysticmissle]

10 to pump 8 everywhere else including carb lines if you run e85 will support 850-900 w a large enough pump (I don't think your pump will
Support 600 on e85, but maybe?) More on race fuel but your block won't like much more than 650

[spectramitch]

I probably have about 650hp. I have a fuel cell with a flat bottom no sump. This is the setup as how I acquired the car. Everything located in the trunk. Now that you mention the gravity helping feed it I wonder if this setup as is would even prime if the fuel level was too low.

[mysticmissle]

You can raise that up or get an aluminum and put it on pedestals
I agree not going to work well when less than 1/2 tank

[Dragncar]

69 A body. I put a 5 gallon cell in my car. Those factory plugs, I welded a steel 10 AN male/male fitting and a black iron 1/2" steel coupler. Used full flow 90 deg fittings, 10 AN to the Robb Mc 100 micron filter. Its right under the trunk. Then it goes to a Dynaflow 300 pump. Its mounted inside the frame rail right behind the passenger tire. I even welded a black iron 1/4" NPT fitting on the same plate for a 1/2" vent to my tank. Made the plate out of 1/8" flat bar. Did not have to drill and holes in my trunk.
It primes perfectly and looks nice IMO.
There is a bunch of stuff around the car right now. If i have time i will get some picks up.
You are always wanting to go with the intake side of the pump being one size bigger than the out feed side. Not going to hurt anything if its 2 sizes bigger. I would have ran a 3/4" to the filter/pump but I could not get all 3 of my fittings on that plate doing it. If you did two 1/2" NPT couplers you can run pretty much whatever size hose you want through them.

[Dragncar]

I took a few pics. Note, most of the red is red primer.
It was quite a bit of work to get it done but I feel a lot safer with a 5 gallon cell vs the factory tank at over 1/2 full.
My battery in the trunk also goes through those factory plugs with bulkhead electrical fittings.

[Bob with the 66]

Maybe this will help, there website said that these sizes will work up to 2000 hp with the right pump set-up.

[Bill Eveland]

Mine are 10 supply and 8 return. I have had good luck with the Evil Energy ptfe line and fitting kits from amazon. i did have an aeromotive ss pump was rated for about 750 on 110, but only like 525 e85. So upgraded to an Aeromotove A1000 pump and filters on both sides of the pump. they are mounted to the bottom side of the car, also had to put a large relay in for the bigger pump. Aeromotive return regulator as well...

[Bob with the 66]

Here is the Product Engineering regulator install if needed and a picture of my drag car build.

[hojs69]

Bob, slick setup. Right at the carb and neat.

Where did you find the regulator mount? I do not see it on the PE website for example. How does bracket bolt up at the rear most bolt? It does not appear to attach to the carb mounting stud.

Sorry, to the OP if this is a side track.

[chuckies76ta]

Originally Posted by Bob with the 66

Here is the Product Engineering regulator install if needed and a picture of my drag car build.

If possible could you post the make of the intake and top piece to carburetor. Looks so cool. Thanks

[hojs69]

It's a Marcella manifold.

https://www.facebook.com/Marcellamanufoldsinc/

[chuckies76ta]

Thank you.

[Bob with the 66]

Originally Posted by hojs69

Bob, slick setup. Right at the carb and neat.

Where did you find the regulator mount? I do not see it on the PE website for example. How does bracket bolt up at the rear most bolt? It does not appear to attach to the carb mounting stud.

Sorry, to the OP if this is a side track.

If I remember correctly, the regulator mount was a Jeg's brand, and I just had to grind out the top center hole to match the egg-shaped PE Design regulator and enlarge the four mounting holes just a little bit.
Also, both ends of the bracket slip over the carb mounting studs.

[Bob with the 66]

Originally Posted by chuckies76ta

If possible could you post the make of the intake and top piece to carburetor. Looks so cool. Thanks

hojs69 is right on, Marcella made the intake for his engine originally, and I bought it from him once he was no longer using it. (He makes great stuff)

[spectramitch]

I'm wanting to put the old reliable Mallory 250 pump on the shelf and replace it with a new one. Any recommendations on a new electric pump? Magnafuel looks like a popular choice, and I do a lot of street cruising too. Engine combo is in my first post.