carb guys inside please..
 

well i just got a new 750 CFM holley w/ vacuum secondaries. it has about 30 mins of run time from the guy i bought it off of. basically brand new. well here's the problem.. it idles great but as soon as u try to take it off idle it starts sputterin out and fallin on its face..i adjusted the floats correctly (when i take the screw out the gas is just to the bottom of the hole and just barely trickles out) i'll do this and it runs great for about 5-10 minutes and then starts doing the same thing again. i'll mess with the float levels and then re adjust it and it will run perfect for about 5-10 more minutes and start doing the same thing again.. also when its acting up if i put it at half throttle it will rev up and start surging like its running out of gas. the fuel pump is brand new and there is no problems with the fuel system.. what could be causing this?? sticky floats or what?

thanks! :cool:

Cover the choke with your hand while you're revving it. If the float is stuck that will usually un-stick it.

Call Mike, he's the old carb pro ;)

when i do that the car just dies... :lol:

Pull the needle seat assembly out and check for dirt or something stuck in the seat. Re assemble, set floats, and check. Is this with the air cleaner on, how tall is your air filter, make sure the lid has enough clearence above the vents.

this is with the air cleaner off

You ever figure out the problem? Did you check the power valve? (Just a guess).

Replying for Jim since he's out of town:

He took it apart and found it all clogged up from old gas.. Got frustrated and put it on hold til he gets back from KY.

Looks like he found the problem then! :bna:

yeah i have it all figured out and put back together. i just need a new accel. pump and i'll be good to go! :bna:

Been meaning to tell ya... Mike has that part for you.

Sweet!! i dont know when i'll get it but i'll let ya know :cool: