Check my thinking on my carb fuel system.....

**mach351** · 03-17-2018, 07:48 PM

So for years I’ve ran a Bosch efi drag pump on my carb motor by way of a bypass regulator kicking my pressure down to 5-7psi. It’s worked great. Love the Bosch pump will never go back to a Holley or any other rattletrap. I recently had a failure though where my regulator (which is mounted on a distribution manifold on the motor) broke off due to a harmonic/cracking issue. Motor lost pressure of course at 7500 and burned #5. Now I’m re thinking my setup. Why are regulators always mounted near the motor? In an EFI situation I can understand, but with a 7psi carb system why can’t I mount my regulator in the boat near the pump, and just run a single line of regulated fuel to the motor? Again, with efi it would be bad to have 5 or 6 feet of highly pressurized line running that far.....but with my low pressure carb setup? I’ve been toying with this idea for a while now, and can’t really come up with a downfall. One line in, instead of two (fuel in and return out).....less fuel system hanging on the side of the motor....getting hot and at risk.....

Am I thinking wrong? This should work, right?

**90 5.0** · 03-17-2018, 08:22 PM

Originally Posted by mach351

So for years I’ve ran a Bosch efi drag pump on my carb motor by way of a bypass regulator kicking my pressure down to 5-7psi. It’s worked great. Love the Bosch pump will never go back to a Holley or any other rattletrap. I recently had a failure though where my regulator (which is mounted on a distribution manifold on the motor) broke off due to a harmonic/cracking issue. Motor lost pressure of course at 7500 and burned #5. Now I’m re thinking my setup. Why are regulators always mounted near the motor? In an EFI situation I can understand, but with a 7psi carb system why can’t I mount my regulator in the boat near the pump, and just run a single line of regulated fuel to the motor? Again, with efi it would be bad to have 5 or 6 feet of highly pressurized line running that far.....but with my low pressure carb setup? I’ve been toying with this idea for a while now, and can’t really come up with a downfall. One line in, instead of two (fuel in and return out).....less fuel system hanging on the side of the motor....getting hot and at risk.....

Am I thinking wrong? This should work, right?

A lot of people have their carb reg in the boat in the rear.

Thats where mine is on my Drag

**nitro_rat** · 03-17-2018, 08:43 PM

My reg is in the boat too. Still running the blue rattle trap because it won’t seem to die!

**magnum2.5** · 03-17-2018, 09:06 PM

I run a return regulator next to my pump in the boat, only way I could stablize the fuel pressure to my top carbs on the v/8, with out flooding the rest of the carbs, works great, extra gas goes back in the tank...