for anyone that is converting from a efi car to a carb here is a usefull bit of info. If you dont want to buy a new fuel pump to run the lower psi a carb needs you can use your exixting one with a certain regulator. Its a mallory part#4309 which is a return style regulator which is adjustable from 3-50psi with diff springs. Use your existing feed and return line. Just buy a few feet of braided line and a few an fittings to run from the lines to your regulator. This worked great for me on my GTA just thought id share with you...

 

Thanks, but we know. BG makes a bypass-style regulator too, those are about your only options. the fittings in both of those regulators are just 3/8" NPT I believe..you don't need any an line if you don't want to foot the bill.

If you want my opinion tho...DON'T do it that way. Decent carb pumps are only like $40. Your stock EFI pump will die eventually..probably sooner rather than later, and you will have wasted $80 on a regulator. IMO, it's worth the extra work to swap in the first place.

 

40.00 on a pump? are youi talking electric or mechanical "curious" so do you wind up sumping your tank or welding fittings to the underside and doing it the easy way? Im sure my pump will last a while I have already installed a walbro 255 intank. I am going back to efi soon anyway once I get my DFI sorted out...

Andrew

 

I was talking about a mechanical, but electrics are still about the same price as the regulator alone.

I personally have a fitting welded to my tank, with a 140gph external electric running to a boost referended regulator.

I definatly wouldn't say what I did in my last post if you already had a Walbro. Then such a regulator would be the way to go.

 

Hey Jester..where did you weld this fitting in your tank?

 

in the middle, at the lowest point

 

Hmmm.... I'm planning on (and have bought) the Holley regulator 12-803 to use with my Holley high pressure in-tank pump when I go carb (don't ask. OK, OK, I tried a failed TPI swap *hangs head in shame*). Am I asking for trouble?

 

yeah..I'm afraid you are. a normal dead-head style regulator will burn a high pressure pump out before too long. you need a bypass regulator and return line.

 

The Holley reg. has a fitting for a return line. I thought that it was a deadhead style regulator, too, until someone here told me it wasn't. Is there something else about this FPR that would cause me to stay away from it? I REALLY don't want to drop the tank again. 'Course, if I do, it's coming out for good, and I'm putting in a fuel cell.

thanks

James

 

Unless I'm seriously mistaken, that regulator is not designed to use a return line. There are only 2 regs I know of for under $100 that do. the one from Mallory, and the one from BG.

 

After looking at again, there are three female ends for fittings, one is labelled "In" and there are two labelled "out", one of which is plugged. Is one of these not able to be used as a return line? Is it perhaps supposed to be used for dual carb setups? I could have sworn that someone else here was using the Holley regulator with an in-tank pump.

 

It has 2 feed lines not one of them is for a return.. dont try to do it either... not good....

Andrew

 

ok, i'm planning a carb swap.....i'd like to stay away from changing fuel pumps if i have to b/c i just had mine replaced in my TPI car.......what options do i have...or should i say..what are my best options

 

Run the Mallory regulator #4309 with the return line hooked up to your stock return.

 

Looks like I'll be calling summit again!!

 

The good thing about using a stock TPI pump and the Mallory regulator combo is that at only 6-7 PSI pressure required to feed a carb the high pressure/high flow in-tank electric pump (even a stock one) will pump about a billion gallons of fuel an hour.

Well, not a billion, but a LOT of fuel at that low a pressure. Feeding a 500 HP motor would not be a problem with that setup.

Replacing it when it eventually burns out, however: Not fun. Unless you're into cutting a hole in the trunk of your car!

 

What about hooking another regulator into the second feed port and then routing it to the return line. Looking for an econo way to do this.

 

hmmmmmmmmmm(rubs chin in thought)

 

how long do you think that my tbi pump will last with a regular regulator?

 

anybody know?

 

mine lasted about 5000 miles.