I'm working on putting a carb'd 350 into a 93 Fbody. My question is....can I just run a fuel pressure regulator in line before the carb? What about the stock return line? One guy was telling me that the stock fuel pump might not supply enough fuel. He thought I should either run the stock pump into a pressure regulator and then run that into a mechanical fuel pump, or just get rid of all that and just run a hose in the tank to the mechanical pump. What do you guys think would be the best set up for something like this?

 

The EFI pump will not work.....

Put a bulkhead in the bottom of the tank and get one of the fuel system kits.....How much h.p. you thinking?

I just installed one of the kits for a friend he got it from summit come with everything for less than $250

 

well right now the motor makes about 450HP. I plan to spray it with a 150-200 shot this season or next if I can't afford it right now. so upwards of 600hp i would say. DO you happen to know a part number from summit for the kit you were talking about?

 

no I don't but it was only rated for 400.....

Look into spending some money, fuel system is not a place you want to cut corners...esp. on gas

 

http://store.summitracing.com/partde...&view=1&N=700+

 

ok but that looks like a regulator, a pump, some lines and fittings.....what do i need any of that for if I was running this motor before on a Mechanical pump that produces the 7-9psi i need and supplies plenty? All i would think i would need is some sort of pick up system from the tank. Correct me if i'm wrong.

 

yeah you could go that route if its what you want.....take the sending unit out...put a pick up tube in it and run a lin to the front.....You understand that is not the best for performance but it will work...anyway...the pump will need to come out of the tank

 

Ok thats what I thought, and I figured the pump would have to come out....my question is why do you think it is not as good for performance? whats the difference if your pushing it to the motor and regulating it with a regulator, or if your pulling it to the motor at feeding it with the psi it needs? I'm not doubting you just wondering the logic behind it?

 

a mechanical pump has a parrasidic power loss
its always easier to push then pull
Are you spraying this thing with a mechanical pump? I would never try that

 

At this point I have not put spray on the motor. I understand the idea of parasitic power loss. But if the mechanical fuel pump can supply the 7-9psi of fuel pressure needed to run nitrous safely all the time..idle or wot..is there really anything else wrong with it or bad about it? I understand you would not want to be spraying the juice if you didn't have sufficient fuel pressure to do so. And if you were running a pressure gauge to monitor it all the way down the track it seems like it would not be a problem. And thank you for all your info I value it greatly.

 

I don't know too much about the mechanical pumps in performance apps but I was once told that it pulses each time the eccentric comesaroud and that is bad for your nitrous b/c it not gettin a good steady pressure or volume its pullsing it up there.....

Give it a try.....But also at the power levels you said you may want to upgrade to a better pump

 

Ok i could see that making sense. But yeah I have upgraded i am running a nice Holly pump that was recommended to me by and engine builder when i told him i was going to run nitrous on it. Thats why i asked you so many questions since you can't trust everyone, and he might have been the one that was wrong (not saying either of you are wrong). Your logic makes sense, there might be a small fraction of a second where it would loose a small amount of pressure or flow, but running a plate system as I plan i think the atomization process would still even that out and not cause any real problems other then maybe a power loss.Now i could imagine running a direct port injections system upwards of 300-500 hp shot might not be a good idea.