Starting line hesitation

[Mike Pearson]

Originally Posted by Mike Semeniuk

Fuel Pressure is related to the size of needle and seat, and float settings and of course demand. I need to run mine at 5.5 for best operation , anything over 6 and - too many issues

Mine runs good at 6 lbs too.

[Cdncarnut]

I am running a Joe Scott at 7 psi with no issues.
My Ashley was also running at that same pressure.

[HandOverFist]

I have run ours at pressures of 6 to 7.5psi without issue...currently at 6.5psi.

[Mark Yacavone]

I'm really not getting how you could bind up that secondary plate deal.
The last thing you would do is set the metering rod tips down into the fixed jets.At that point the hanger would be down flat on the cam arm. You can slide the whole deal fore and aft to check everything before you put the hanger screw in place.

Danny did a nice job on that deal. I never did get that fancy. I just took a small chunk of a Walmart bag and cut a couple of x's in it, then stuck it down to the gasket with a spot of chewing gum until I got the top was screwed on.
That works fine ,and doesn't restrict or bind the swing of the rods like the old tape trick did.

[Joe DeMarzo]

Just in case... check the accelerator pump. Every time mine hesitates or stumbles off the line the gasket is dried out from sitting, torn or worn out and doesn't seal because of VP eating at the gasket. Q-Jets do not like a lot of fuel pressure so 6 to 7.5 is fine. You can play with that but not is why it is hesitating in my opinion. Let us know so we can learn, Q-Jet are great but can make you crazzzzy.

[Mike Taylor 3601]

I would say your gasket is bad like Joe said, or needle and seat is leaking. My car has done that before,finally figured out it was needle and seat, I have them leak,but they don't pour fuel out of it,they will leak slightly,car will idle about 200-300 rpm slower,and bogs a few feet out.
The best test I have come up with is remove top and hold float pivot rod with your finger so float works like the top is on carb,then have someone turn on fuel pump, after needle and seat closes watch fuel level in bowl for 1-2 minutes,it should not creep any higher up at all,it may take a minute and if leaking will rise very slowly, be careful sometimes when first turn on pump it will spray fuel out,I usually use my other hand as a shield over carb,till it calms down.
The best thing I have found to prevent this problem is to run carb dry and pump fuel out of tank when I get down racing and store the car,even for one week.
Mark,
I still use the tape trick, I use 3M super33 tape is a soft and flexible electrical tape.

Mike Taylor 3601