I've got a 3x2 setup on my flathead.A 97 in the center and 81's on the outside.Mismatched I know.But that's what I had. Here's my problem... In the morning when I go to fire it up,I get a fuel pouring out off the emulsion tubes on all 3 carbs.Today I pulled off the ScoTT top and the float bowl was almost empty.I have no idea where the fuel is going and it seems like when I turn the fuel pump on it pisses fuel until the float bowl is full.Then it stops. Any help would be great. Shane Here's video of it in action.
You might have to much fuel pressure, with strombergs you want 2-4 lbs, or it blows the needle off the seat. Also make sure your float level is set right, or that could bleed fuel into the throttle bores as well. Jimmy White
Hey Jimmy I'm running 2-1/2 pounds fuel pressure,and the floats are set to 15/32's to 1/2" down.Parrallel to the top of the float bowl. Shane
it started spraying the instant the pump came on- that looks like an initial pressure spike to me. Might have to come up with regulator that will not allow the spike at all- i take it you have a dead head system? maybe a return style will improve things....
Ya...As soon as the pump is on it starts pouring in. I'm running those ScoTT tops and they don't have any breather holes.Do the stock ones have some kind of breaher holes in them.It is a dead end system.I'm thinking that if the bowls are empty and you start pushing fuel in,the extra pressure has to go somewhere.Maybe p***ed the needle and seat??? Also.I don't know where all the fuel is going.Maybe a drip or two on the outside,but that's it.Could it be leaking from the inside and drain down into the motor over night?Where would I look for that? Shane
Why out of one emulsion tub..fuel pressure, then both emulsion would pour out with gas..The pressure may be high and that needs to be addressed..The issue is only one tub is pouring fuel??????????? I set my floats level to the top of the fuel bowl, no gauge, works all the time..I wondering why only one tub???? I think the accelerator pump isn't correct, or one jet is plugged. I would take the 97 off and re-clean.. Keep us posted.. Duane. ps..Are you getting fuel from the idle tubs to the outlets in the base..
Hey Duane The fuel pressure is set to 2-1/2 pounds.I have a gauge right after the fuel pump at the back of the car.The float bowls seem to drain over night.When I turn the fuel pump on it pisses out BOTH emulsion tubes on ALL 3 carbs. Is there a difference in accelerator pumps? If its not leaking externally,where could it be draining from? Shane I don't know much about these things. How would I check that?
Hello..If your fuel bowls are draining, I would ***ume that the power valve gasket is bad or the PV is bad and bleeding through..I'm not sure if the check valve,( it's located inside the center br*** plug.) The little steel ball should move, for open and closing. What kind of fuel pump, what kind of pressure gauge and fuel pressure regulator??? I would move the gauge close to the 97s use a good regulator and pressure gauge.. With the bowl empty and during filling the fuel could be splashing over into the accelerator pump cylinder???????? It is hard to diagnose without being there.. Don't give up.. Let us know.. Duane.
Ok... I was looking at a stock top and noticed that it has a vent hole just behind the accelerator pump.ScoTT tops don't.I figure the pressure of the fuel going into the bowl,as the bowl is filling up,has no where to go,so it's being pushed out through the emulsion tubes. I drained the fuel from the bowl,stuck on the stock top and turned on the fuel pump. No fuel came out of the emulsion tubes! Are these ScoTT tops made for a race only application? Why no vents? Thanks Shane
OK, you found the issue..can you drill the ScoTTs. I've never heard of that problem befor. I have used then and no issues..Could be the it was never done..Poor quality control??????????????? Good Job.. Duane.
Thanks Duane I just took the car out for a blast.The old tops seem to be working good. That must have been it.I'm going to the Hotrod-a-Rama next weekend,but after that I think I'll try and drill some breather holes in the ScoTTs.Probably put in a little tube about 1" up.That should do it. I'll keep you informed. Thanks again. Shane
I had the same poroblem with mine i removed the upper gasket from the pump and they work great ...I did not want to drill a vent
The Jalopy Journal
