I went to start the new motor saturday and it wont start. I have no experiance on Holly carbs. It is a 3310 and it squirts gas at the top when at full throttle but it wont start and bone dry insde intake.  float levels are perfect. Fuel pressure from electric fuel pump is 4psi and sometimes 3psi. Kinda low but it should still start and idle.  Squirt either in it and it fires right up.  Is this enough fuel pressure to start and idle at least or does anyone think it is the carb?  I just had it overhauled about 6 months ago and have not ran it til now.  Any suggestions please... I am stumpped...   

Is it backfiring or anything weird? I agree, keep the ether away from it!

If the carb is spitting fuel when you look down it's throats then you run it manually, I would guess timing is way off. Either Dizzy timing (Could be 180* out), or cam timing, which is another one I ran into........BBC Keyways are NOT a timing mark.......just an FYI and saw this first hand more than once and very recently. The BBC crank keyway at #1 TDC should be roughly 45* clockwise from straight up............Timing marks on these double rollers can be very confusing if you're not familiar with them.

Anyways, good luck with it, but I doubt it's your carb. Save the ether for gassing the old lady or something productive with it tho!   

Ray

Have you tired adjusting the mixture screws. Turn all the way in then about 2.5 turns out is a starting point. Are you sure you have the floats set to where fuel just trickles out of the float bowl screws. Even if your accel pump shot is weak it should still run, a poorly adjusted accel pump shot has nothing to do with starting. It is just enrichment where the jets cannot keep up. I always ran my Holleys at 6psi from idle to WOT and never had a problem with them.
T.J.

Have you tired adjusting the mixture screws. Turn all the way in then about 2.5 turns out is a starting point.
T.J.

No disrespect TJ, but Holley recommends 1.5 turns out as a starting point

No disrespect TJ, but Holley recommends 1.5 turns out as a starting point

I stand corrected yes 1.5 turns. I am uses to EFI.

How would the idle air  adjustment have anything to do with his situation?   

If he dumps gas in it starts,  either, it starts.

If he pumps his acc pump it should then start.  It doesn't.    No fuel in the bowl or his pump is totally plugged.

I would bet the needle and seat hung up.   Idle air screws won't do anything for you till it IS running.

The acc pump is what will give you that fuel priming shot.

Playing with the idle air screws was just a BAD idea and serves no porpose other than to create another issue.

Sorry to disagree with you guys but...

   

just to be on the safe side you may also want to see if that little filter in the inlet of that carb, is not clogged! not all carb shops look at that simple stuff!!!! 

nice work getting it sorted out.  sucks how its something stupid someone else did trying to make things look "nice" and in the end caused more trouble than it was worth.