I need Fuel System help. I just don't understand......

[spcedwards214]

Ok so I went from a deadhead style system to a return style system. I have a 125 GPH quick fuel pump and ran all new stainless braided -6an fuel line and an fitting to a return style speedmaster fuel regulator. I called the manufacture and they confirmed that the bottom is the inlet, two sides are outlets, and front is return (see pictures). Turning key like that, it pumps fuel out of every office of the carb so it has to be seeing the full 14psi full pressure. But if I run the supply like to the front (where the return was) and return line to the bottom (where supply was previously) and leaving the outlet on the side where it was (keep in mind there is no wording on the billet aluminum regulator as to what is what which is why I called), the fuel doesn't shoot out everywhere but eventually starts to drip inside the carb. EITHER WAY I PUT IT, THE FUEL PRESSURE GAUGE DOES NOT GIVE A READING AND THIS IS WHAT I REALLY DON'T UNDERSTAND, EVEN TRIED A NEW GAUGE. I'm just lost as can be. Someone please throw me some ideas. Thanks in advance.

 

[Hemi Rebel]

What happens when you adgust the regulator? Should start with it all the way out. It screws in to increase pressure

 

[snakeoil24]

The return line should connect to bottom. remember the inlet and outlet should be the same part of the plenum of the regulator. The only thing that happens is a cone will lift off its seat if pressure goes above set point. If the return back to tank is restricted or below fuel level the return pressure will dead head and be inaccurate.

 

[HawkRod]

I have a high pressure return fuel system for a FAST fuel injection system, but my regulator, like snakeoil24 says, has the return at the bottom. The top two are the supply. (In my application I only use one inlet since my fuel supply routes through my throttle body.)

I would think the two top lines in your application should be the fuel supply inlet (from fuel pump) and supply for the carb with the lower line being the return. Then, as Hemi Rebel states, start out with the knob all the way out, which should be minimum pressure. The turn the knob in slowly to increase pressure.

Good luck.

 

[spcedwards214]

I have my return line coming in the top part of the fuel cell. The only thing I think of is that the two side ports are inlets, front being to carb and bottom to return. That's the only thing I haven't tried yet but I sure will this afternoon. Thanks for the input guys, this is my first fresh fuel system with return I've ever built and what's worse is that the manufacture told me that how I started with it was correct but there's absolutely no way because it's seeing full pressure constantly. Now i'm going to assume my motor is flooded. ahh I really don't want to have to pull the plugs....To be continued

 

[spcedwards214]

Update. with regulator screw turned all the way out for minimal pressure I made the side port inlet, other side port supply to carb and bottom the return and I got fuel pressure readings on the gauge but still overflowing through the two ports out the top of the carb (pic 1), changed up the setup again to side port as inlet, front the supply to the carb and left the bottom as return, once again got a good fuel gauge reading but this time its constantly coming out the ports inside the carb (pic 2). So now that I know I have the regulator setup correctly I think, what can I do about the constant over flow inside the carb?

I'm trying to get this new motor ready for break in but can't seem to get this carb right.
Main question: Should I be able to turn ignition on (turning on fuel pump) and it build enough pressure (around 8psi or whatever and it not come out anywhere in the carb before I start the motor? I know the return is working good now cause you can hear it going back into the cell. I would think I would be able to turn the key and it pressurize but not give any fuel till I start the car correct? Thanks again guys

 

[HawkRod]

When you turn the key on you are pressurizing the fuel system AND pressurizing the inlet to the carb. Your carb float bowls determine when it fills with fuel, and my guess at this point is that you have too much pressure and it is overwhelming your float bowls and forcing itself into the carb. If you have turned the dial all the way out, then you may need to turn to the carb and increase spring pressure for the needles and seats. But, that is just a guess as I have never had a carbureted and electric fuel pump system. Others may be able to comment. I thought carbs always wanted 4-6 PSI...

 

[mopar 3 B]

Have you set or checked the carb float levels. If floats are set to high will cause leaking of fuel.

 

[snakeoil24]

Set regulator to 4 psi and see what happens. If this does not work change to 2 psi. This fails you have the wrong spring in the regulator.

 

[spcedwards214]

I have the regulator set all the way out to about 2 psi, the regulator is a return style inline regulator and the carb is brand new. Not sure how or what I could do about the spring. Im just ready to get her running but I keep going back to steps to gain knowledge not even one step ahead anymore. lol

 

[Bigal75]

I was looking at your set up. You're using a fuel log...maybe I'm way out in left field but might it need to be plumbed differently? Fuel into the log 1st then regulator and return?

 

[Icecobra]

If your seeing fuel dripping flowing leaking anything at the carb and it is not the fitting to hook to the carb your problem is the (in) carb... Check stuck floats, seals. etc. they leak if to much pressure is feeding the carb.. Might try to bypass everything and try a mechanical fuel pump to see if the problem persists and if it does then again the problem is the carb. If it does not then the problem is pressure to the carb... Testing sucks I know..

 

[spcedwards214]

Figured it out bottom inlet side to supply carb and front is return the issue was the floats being to high but of course you figure one problem out and it leads to another.thanks for all the help though guys.