hoping for some help

[benno440]

just got my mechanical "race pump" (this is actual brand) for the 440 stroker, it requires a regulator, i have 2 x 500 cfm carbs i am trying to figure out where to mount the regulator, any ideas?

 

[RustyRatRod]

You run the fuel lines to the carbs, then put the regulator on the return side. This way it acts like an orifice for the return line and regulates fuel pressure. As far as physical location, I always like mine close to the carbs, but it's really not too critical.

 

[benno440]

rusty i am not running a return line, have to run soft fuel lines off carbs as the edebrock carbs ports come out horizontal and not on a 45 degree angle like most carbs, reason is it interferes with myh air cleaner, lol this make sense? so mounting reg. closed to carbs i guess have to make some sort of bracket you reckon?

 

[shag766]

mine on another big horse motor is right before the carb

 

[RustyRatRod]

You need a return line. Period. Here is the correct way to run it. This is from the Atomic EFI site, but also correct for carbureted engines. Notice the placement of the pressure regulator. It should be in the return line, not in the supply line.

 

[benno440]

race pumps say i dont need one to work properly and they say to mount in between pump and carb. my car never had return lines it has vents at the tank and the fuel tank sender/pickup has no lines to facilitate a return line.

i am sort of asking where in engine bay would be a likely place to put the regulator.

 

[67 coronet]

easy place to put it is make a sheetmetal bracket off an intake manifold bolt.works well when you need to mount the regulator low.summit and jegs also have many mounting brackets,depending on your fabrication skills.

 

[64 Post]

Is this a dead head regulator?

Eddy carbs don't like more than 5 psi.

 

[RustyRatRod]

Then ask them where to put the regulator.

 

[Propwash]

Benno......Here's an installation diagram from "Race Pumps" website....A little different than your set up being you don't have mechanical double pumpers, but the Eddy vacuum secondaries. Either way it shows a Bypass regulator with a return line. Deadhead systems (no return) are not as good at keeping a stable fuel pressure, allow more fuel pressure spikes and are back to the typical vapor lock/fuel boiling issues associated with mopar fuel systems (especially the eddy's and there low profile intakes). Good luck whatever route you go.

 

[benno440]

hmm i just dont know how i can route a return line as my fuel pickup/sender on the tank has only 2 ports onoe for the outlet to the carb and one for the vent hose which runs up to the gas cap. any suggestions? i was told if my car had this setup it didnt need a return line. i am getting confused here. also the race pumps regulator has a 1/8" barb for running a clean air line off it.

any suggestions?

- - - Updated - - -

dead head it is a race pump reg. it runs from 7-15 psi for carb or 45-90 for efi.

 

[Propwash]

Your fuel tank itself has no vents? My bird has two of them on the tank besides the vent line incorporated in the sending unit faceplate. I got to hand it to you man, you'll have no issues feeding the engine with that pump. Max 450 GPH wow...

 

[RustyRatRod]

Real simple. Cut the vent line about the same length the supply line is coming off the sender. Throw the rest of the vent line in the garbage. Attach the return line to the cut off vent line on the sender. Get a vented gas cap. You're in business. Now really, is life so difficult?

 

[benno440]

no life is not hard, just going off what you told me in previous posts rusty is that if my car never came with a return line i would not need one, as it is already vented.

- - - Updated - - -

Your fuel tank itself has no vents? My bird has two of them on the tank besides the vent line incorporated in the sending unit faceplate. I got to hand it to you man, you'll have no issues feeding the engine with that pump. Max 450 GPH wow...

yes it has a single vent that runs upto the gas cap.

yeh dfeinetly no problems with fuel now haha

 

[Meep-Meep]

I have run the standard Holley regulator after the pump and before the fuel inlet on the carb and it seems to work fine. I have never done what Rusty suggests but I do like it much better from a fluid dynamics standpoint. If you can get a hold of some steel 5/16" line and run it along side the fuel line, then remove the filler neck and poke a hole in the side and solder in a brass fitting to attach a hose, you now have a return line without disturbing your factory vent line. I ran 7 PSI on my EDDY 750 with no problems at all. Just look at the carb manual and do exactly what it says. Note: Having the proper fuel pressure will maintain proper fuel level in the bowl.

 

[Propwash]

Can't really speak for the guy but i'm guessing the point Rusty was trying to get across was with that caliber of fuel system, you want a return line. With that whopping pump you have, it makes the pumps that came on the 440 6 pack and 426 look like a 10 gallon aquarium pump for a kids fishbowl. Those engines came with return lines in most cases..

I'm sure you could run a deadhead system, but not really the premium thing to do. I guess it's all up for debate, but if you look at any higher pressure/GPH systems, a majority have a regulator with bypass on the backside, including most of all fuel injection systems, waste gates on turbo's, pressurized fuel systems in aircraft. Best bet would be to call the MFG and drill the question over and over. Obviously that pump is a bit outside the norm so maybe there's some outstanding dynamics that make it different.

 

[shag766]

pressure

this engine has no return line. the pressure block is hidden by the breather vent on the cover, but it is there. i know the glare of steve's head might make it hard to see but it is what it is. lol sorry steve. these guys might know what they are doing, maybe. 823hp on pump gas. it is a clay smith pump. i have another pic that is more definitive but this is a mopar form. :headbang:

 

[Propwash]

Hey Shag....I just bought the Clay Smith 6 valve for my 512 build...How was the fit up on that pump for you if you don't mind me asking?

 

[shag766]

Hey Shag....I just bought the Clay Smith 6 valve for my 512 build...How was the fit up on that pump for you if you don't mind me asking?

"fit up" meaning what prop. it came installed on the motor and i just plumbed to it. 1/2" pick/up to pump to carb. if it's any piece of mind the guy who owns westech is a buddy of mine and he swears by them. a couple of times i was there and they were making big power on the dyno with a smith mechanical pump. i forget how much he told me they are capable of but if you want to know i will find out.

 

[Propwash]

I was told there would be some light grinding on the side of the pump for clearance with the mopar B/RB motors from George at Clay Smith. Just wondering if you had to do the same. The Pump itself looks like the old NASCAR 6 valve series, just like in your pic. Comparing the Clay to a similar Hi-flow Eddy pump I had on a 383, it looks like Georgia was right on base as far a shaving some off, but just digging to see if you had some insight on any clearance issues.



Sorry to get off base Benno