Fuel regulator/bypass

[billetbirdcage]

directly from the driver...>>>>>>>>>>>>>>>..Sure. During the feature, when I run the bottom and drive off into the corner, and go to pick up the throttle at the 1/4 mark or so of the corner, the car stumbles and hesitates repeatedly through the duration of the corner. When i get onto the straightaway, it will clean up about at the flag stand and run smoothly. It was the same symptoms at and did it intermittently in practice at Boothill, but seemed to be at its worse when really throwing the car into the corner. The biggest change we had was when we raised the floats for the feature at Vivian. It actually made it worse. When we adjusted them back down for hot lapping after, it was back to where we were in the heat race and hot laps. It makes no sense, but it does appear to be better when I run around the top versus trying to roll the bottom.

Going off what he said it sounds like this:

Fuel maybe over flowing and flooding carb due too:

1. Floats being to high
2. Too much fuel pressure thus over filling bowls and running into boosters of car or out the vents
3. Fuel pressure keeps climbing and at end of straight its too high and overflowing and once you lift on throttle for entry (no longer consuming the fuel) it over flows into carb and thus when you pick up throttle it's pig rich and takes a while to keep out

It may not being doing it as bad on the top of the track (assume banking on top and none to little on bottom) because the car is leaned less to the right due to banking. It's possible you need an angled spacer on carb so fuel isn't going to the right side messing with float levels and over filling enough that it's running fuel out of the vents or boosters.

Keep in mind that large needles and seats don't require a ton of pressure, think large hose and low pressure to deliver the same amount of fuel as small hose and high pressure.

[north louisiana dirt]

thank you Sir... we are working up a plan to address these issues.... I took the carb apart today and did not see any obvious generic issues... I have never used a belt drive pump with a check valve , only bypass regulators before this.... I can't believe this was designed to Loop the excess fuel from the pump through the check valve right back into the gravity feed side of the pump and not return it back to the tank..... we are going to put the carb back on, remove the line from the check valve and run a hose to a fuel jug and crank the car and see how much fuel is being pushed through the check valve... From the first time I looked at this set up it looked wrong to me.....but the guy that we got the car from said they had no issues..... but who knows about the truth in that.... :-)