Just curious, but they need to be 38psi.

If you were doing the carb conversion, could you not just use your standard FI pump with return lines, except hook up a marren FPR set for 38 psi to the carb? The excess pressure/fuel could be returned to the tank?

just a thought.

 

I heard that over time it can damage your stock fuel pump. Someone correct me if I am wrong?

 

38psi...
bye bye carb....
get a fuel press regulator...
you want around 4-6psi for carb

 

oh ****, I thought it was 38psi for the carb. whoops. I don't think a regulator exists to stop that much pressure right? Not only that, but if you stopped that much pressure then im pretty sure mazdadude is right, and you'd wear out your pump..

*EDIT*
eh, I got that mixed up. The pressure regulator would bypass all pressure except for 4psi, the rest of it would go down the return line. The pump wouldnt be working any harder than it would for a fuel injected setup right?

 

They make adjustable pressure regulators. I was looking at the ones from Aeromotive last night. Several models are available which would work. It takes some trickery, but you can use a bypass style regulator for this.

Not sure why you would want to though...

 

Easy, so you don't have to go out and buy a low pressure pump, let alone try and get your old one outta there either.

 

Holley Blue $100 with regulator.

 

It's not all too difficult to install a low pressure pump, a hell of a lot less difficult (and doesn't cost as much) than using a FPR with a bypass

 

That's the stock EFI static pressure.

Correct.

 

You should get rid of the high pressure pump because it will heat the fuel if you run that much bypass.

 

ditto, no point in rigging up an EFI system to run a low pressure system. it just isn't meant to be the way it was setup to run. it would be like running a turbo engine and having 30 cats to restrict the exhaust flow out the tailpipe. i doubt it would be tough to remove the fuel pump and hook it up to act as a pickup tube and run a simple carbureted fuel pump/regulator for a carb setup and it would be the proper setup.

 

You guys are acting like its straining the fuel pump by putting more load and resistance for the fuel. Its not. All that resistance is going back into the tank, the fuel is just pumping. If anything, the fuel pump would be working alot harder if the pressure I wanted was 38 PSI all the time. If it can handle 38, it sure as hell can handle 4. All im saying is less work less money by using parts that are just as good, like the stock EFI pump. Convince me if im wrong, im an open minded person, but so far I think this is going to be fine.

 

It depends really...

No one here would really be able to tell you without doubt that it will either be ok, or it wont be.
Running an EFI pump without some sort of pressure in front of it will make it spin faster.

Things that spin faster generally wont live as long.

Basically I ran mine like that feeding a webber carb for a few weeks and it was fine. It's still working fine now that its running EFI pressure again.

 

Every time the fuel passes through the pump and engine it is heated up. With so much more of the fuel being recirculated compared to before, the fuel will heat up more than usual.