fuel pump pressure ?

[dirttrackrocker]

You are running the exact system I am running. Mechanical pump, Bypass regulator on the back of the fuel log. It should go up and down when you rev the motor, it needs to be 3 at idle 9 at WOT. Are you sure you have the return coming out the bottom of the bypass regulator and not the back? I know LOTS of people running this set up, so don't let anyone tell you it won't work.

[eclipsegse]

the regulator is shaped like a tee one end is on fuel log and other end is plugged off and the center is the return pressure bouces around 3 to 7 at idle and stays at 7.5 when u are on gas it runs fine was just wondering if the pressure was ok

[dirttrackrocker]

Yeah, it will bounce at idle, I would try to get it up closer to 9 at WOT if you can.

[Kojak_9x]

I have always ran 4 psi at idle and 12 at wot. ( BG bypass that bolts on under the carb. Thats with my motor and where I race so it may differ on engine ect.... I want to say I read on BG's website with alky you want 3-5 at idle and 11-13 wot.. Good Luck!!

[tia12]

alcohol is higly volatile. keep it low.

[racin6mod]

here's photos of 3 types of fuel pressure/by-pass systems.the bg kit in the center I fill is the better one but most run the one on the left it's just a simple ball valve that closes as you get on the throttle.the last one to the right is a pressure reg at the back of the log that regulate the fuel pressure going back to the fuel cell it does not work well with alky because your pressure is set and does not adjust as the throttle requires more pressure.I drove for a guy once that used this type it worked on small tracks with the psi set at 9 pounds but it did stumble coming off the corners.

[Dirtrunner35]

I have the one to the right, the regulator at the end of the fuel log. Pressure is about 6 1/2 at idle and goes to 7 off idle .

[powerslide]

here's photos of 3 types of fuel pressure/by-pass systems.the bg kit in the center I fill is the better one but most run the one on the left it's just a simple ball valve that closes as you get on the throttle.the last one to the right is a pressure reg at the back of the log that regulate the fuel pressure going back to the fuel cell it does not work well with alky because your pressure is set and does not adjust as the throttle requires more pressure.I drove for a guy once that used this type it worked on small tracks with the psi set at 9 pounds but it did stumble coming off the corners.

they have multiple types of the one on the right. Some are just a diaphram when pressure gets so high it bypasses. Some have a jet to bypass at idle, then the diaphram is set for full throttle.

I think w/ the stock mount pumps you are to use the throttle bypass like shown in the first 2 pictures. they do the same things just look slightly different.

Some people do run the one on the right w/ a pill with the stock mount pump. But i think the throttle bypass is better w/ stock mount pumps.

[eclipsegse]

mine is like one on right except pressure gauge is hooked up to middle of fuel log and the back of regulator is blocked off we run 7 psi constant and have had no problems