To reduce fuel flow would this work? the perry pump is already restricted on the mixture screw but I am still getting too much fuel.

If you put the "Tee" next to the carb, you will not need the restrictor.

Sounds like your tank is too high and fuel is running through the pump into your carb?

You need a cline demand regulator system?

G'day
Thanks for the reply. Do the perry pumps care where the fuel tank is do they? So the cline regulators don't care. why won't it need a restrictor if the T jont is there?

You have the right idea with the bypass system. Normally, you will want a 3 line tank setup. One for feed, one for return, and one for vent. The feed is the clunk, the vent is standard, and the overflow is a hard line like the vent, but it is turned down and touching the bottom of the tank, towards the front. That way the flow back into the tank won't interfere with the pickup at the rear of the tank.

When you run the bypass system, you need the pump set to max flow, and you may still need to restrict the return line to get enough pressure at the needle. I use a wheel collar, and adjust the set screw to restrict the line.

Make the T for the bypass line as close to the needle valve as possible.

A one way valve is nice to have in the return line, so you can add another T in that line for filling and draining the tank. Without the one way valve, you need to close the needle valve for filling and draining.

Tank position is not an issue with this setup.

It works like a charm on my OS 1.08.

G'day
Not24 do you reckon you could post a picture of this setup please it would be much appreciated.

Okay. This isn't exactly as I described, but it's close. The restrictor goes in the return line before the one way valve. You can even use a remote needle valve for that if you have one. The fuel line to the carb should be shorter, but I didn't really notice any difference.

Perry pumps do not do a very good job of overcoming acceleration forces. If the aircraft is going to pull a lot of Gs then the tank needs to be close to the centerline of the carb.

My experience tells me otherwise.

Did you try to reduce pressure with the pressure adjustment screw? The pressure regulator will allow fuel to flow through because it will maintian prositive pressure and since there is no positive pressure at rest the valve will be open. The cline regulator is called a demand regulator, that is it regulate's pressure at or very near atmospheric. Sometimes a demand regulator will allow a very small amount of fluid at atmospheric pressure, especially if the barometer is low but generally they are closed at rest.