irocz253

My instructor at school brought to my attention that the TPI fuel pump might put out too much fuel pressure for my carb fuel pressure regulator to handle. Anyone have experience with this. He said I could switch to a TBI fuel pump which on puts out around 12 psi. Or maybe an inline electronic fuel pump.

Also since I am not neccesarialy using the ECM anymore that my electronic fuel pump might not turn on.

I only have one wire oil pressure sending unit as well.

Any helpful ideas pleaseeee. Thanks

Tuned Performance

iTrader: (92)

install a fpr to regulate the fuel pressure to 5-8 psi dump the excess back to the tank.
http://www.jegs.com/i/Aeromotive/027...15C=1799558296

irocz253

This is the FPR I am currently using, http://www.quickfueltechnology.com/b...regulator.html should this be able to handle the TPI fuel pump?

92RS_Ttop

iTrader: (3)

Looks like that one should work. It's range is 4.5-9psi output according to Jegs.

There are several members here, including me, that are using a Mallory 4309 regulator. It's cheaper than the one you linked, they were around $50 when I bought mine. Although I got mine on EBay for around half that.

irocz253

My only question is will the regulator I linked above, be able to handle the TPI fuel pump pressure. Without problems.

hdavis2005

I'm using the Quick fuel one also but using a aftermarket fuel pump. I have it set it 4psi.
Does a good job.

obeymybird

iTrader: (4)

That one will not work it don't have a return port by the looks of it. You need to run the xtra psi out of the regulator to the return line.

irocz253

My return line is hooked up

I'm thinking of swapping in a TBI fuel pump for 10 to 12 PSI from the tank for less strain on the pump and regulator.
Then wire my oil sending switch into the fuel pump relay. Shazzaam.

What you guys think?

Ozz1967

iTrader: (4)

I run the Mallory 4307 Regulator and an in-tank 255lph pump that could support 45psi.

I have it regulated down to 5.5psi which is around what you want for a carb and I've been running it that way for 4 years now with no issues.

five7kid

iTrader: (14)

I think that is totally unnecessary and a total waste of money.

Pressure is built up by restriction. If there is no restriction, there is no pressure. The return or "bypass" regulator regulates pressure by returning excess volume back to the tank. There will be no more pressure on the pump outlet than there is on the carb inlet. The extra flow actually helps keep the pump cooler.

The TBI pump has less pressure capability, which means it also has less volume capability.

Keep the TPI pump. When you need to replace the pump (not "if", "when" - it will fail eventually), put in another TPI pump, or an aftermarket pump like a Walbro 255.

92RS_Ttop

iTrader: (3)

Jegs calls it a bypass regulator, which is what you want. I'm still running the original V6 pump with my Mallory regulator and that outputs almost the same pressure as the TPI pumps.

Rhotten_apple92

I switched my tbi to carb and hei. I unpluged my fuel pump thats in the tank and ran a inline pump and fuel pressure gauge. It worked great

John in RI

iTrader: (167)

Remove the in-tank pump and install a block mounted fuel pump for the carb & you will probably never have to drop the tank again.




(P.S. I'd still be sure to regulate to 5.5 or so ! )

jwfirebird

iTrader: (2)

your tpi pump will be fine, as long as hooked the return up, i use a holley regulator thats very similar(i would question if QF didnt buy those from holley), my car is a v6 that is similar pressure to the tpi, and i changed to a 305 in the late 90's with that setup and a few years later when i put my built small block in and i am still using the original gm pump and the same holley regulator

Rhotten_apple92

I left my pump in the tank when I switched over to a carburetor I just unpluged the connector by the tank then installed a inline electrical pump for a carb then installed the fuel gauge to moniter thr pressure it stays right at 5psi

anobii

TBI pumps are so weak you can use a non return style regulator and cap the return line. The pump wont push much more than 17psi and the regulator will handle bumping it down to 4-5 just fine. We've had one running this way on a carbed v8 swapped s10 for years. The TBI pump is pretty close in flow to a holley red.

If you use a TPI pump you need a return style (bypass) regulator specifically for use with a carburetor. No two ways about it. Most return style regulators for EFI wont adjust with a low enough pressure to run a carb. This is the cheapest one i've found new ever. http://www.ebay.com/itm/2-Port-Universal-Billet-Return-Style-Fuel-Pressure-Regulator-Black-/291053323457?pt=Motors_Car_Truck_Parts_Accessories&hash=item43c42144c1&vxp=mtr It's made by procomp electronics (even though it says speedmaster). Dunno how well they're made, but they are almost half the price of a holley 12-803BP which is the next cheapest option.

Cameron@LFM

I switched from a high performance fuel injected setup (huge aftermarket pump, think it ran $500 back 8-9 years ago) to carb. I had to use a regulator (I'm running a supercharger) and run a larger return line. Not a single issue.

anobii

I always forget to mention the return line. If you go up to a 190 or 255 lph pump, the stock return line usually won't be big enough to support the flow at 5psi. Which means you won't be able to adjust the pressure down lower than what the resistance the return line creates.

Barlow8869

iTrader: (1)

http://www.autozone.com/autozone/par...er=926525_0_0_

i used a filter sort of like this on my truck, when i took out the tbi 4.3 and swapped in a carbed crate 350 ... worked well and was under 3 bucks

Aussie Camaro

What if I swap the feed and return lines at the tank? This way the regulator is fed with the smaller diameter hard line and then has the larger line to dump back to the tank?
The way I see it this should allow the regulator to maintain the lower pressure, although it will put a little more pressure on the pump having to force fuel through the smaller line. However, regulated at 5 psi there will still be far less pressure on the pump this way then if you were running injection so I believe it should be fine.
Does anyone agree with this? I'm about to be in the same boat because I have the Walbro 255lph pump in my tank and have decided to go carby with stock fuel lines and an engine bay mounted regulator. The regulator I have recommends a 1/2" return line to tank... but is also capable of Flowing 570lph at 5psi and im flowing less than half this, so I don't believe that I should need to upsize my hard line.
Any input?