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Topic Review (Newest First)
04-04-2013 06:00 PM
PatM Wow. . . Is that quoted right out of a magazine ad?

04-04-2013 04:58 AM
ronnyy2586 Holley's Street Avenger 4-barrel carbs give you trouble-free performance in a good-looking, easy-to-install package. They're calibrated to give you the performance that you need, without the tuning headaches involved with other carbs. And all of this comes with a silver finish that looks as good as it performs! They're available in many different sizes for a variety of engines.
04-03-2013 11:13 PM
PatM Wildb
If I was able to help, I can only say it was a pleasure. One day, I'll post with an issue and you'll be able to help. That is what this site seems to be all about.

04-03-2013 06:38 PM
spinn Did you check the float height with the needle closed? To see how high the float needs to be for reference, and verify seat function.

I think there is a tang on the floats long arm to adjust the leverage on the needle to close the seat. Check the tang. During your initial setting, you could have smashed it bending it in a manner that it will not close the needle.
04-03-2013 06:26 PM
wildb Yes sir, i would have thought at 2.5 psi, there shouldn't be any fuel coming out the vents.
after she cranked up the 1st time and i was breaking in cam, she wasn't sounding quite right. (2,000-2,500 rpm, total timing @ 36*). when we shut er down, i changed oil & filter and pulled bowls to check float levels. they were so low from trying to get intank pump to work, suprised any fuel actually in bowl. after settin dry adj.(yeh,shulda checked before), she cranked & runs great.
sbc thru set of flowmasters....sweet music.
04-03-2013 05:24 PM
spinn Strange, the people are correct . At 2.5 psi of fuel pressure , the needle should remain on the seat.

The correct initial float setting , if the nut is grabbing the adjustment collar, would only allow fuel to drip out the bowl when the carb is knocked on the side.

If it is operating in some rough idle or hill area adding a spring in the needle and seat will help close it to maintain float height.
04-03-2013 03:32 PM
wildb Sorry guys, been a little busy. New update...dropped tank, pulled intank pump, installed mech pump & bypassed regulator. Truck cranked on second spin, NO fuel out of carb vents, all adjustments now in spec's.

My take is the CONSTANT pressure from the intank pump is too much for the carb to handle, even with the regulator set @ 2.5 psi. Not quite sure how those guys who say that they use the intank pump & regulator are getting it to work. I tried everything.

truck runs great now with mech pump pushing 5 psi.

ssmonty & PatM,
Thanks so much for all your input. I've learned a bunch reading these forums over time so I decided to join. Hope to 'talk' with you all soon.
04-01-2013 04:52 PM
ssmonty I've got to say your not adjusting the float correctly. You said fuel was trickling out of the site plug.
You should be able to keep it from coming out the site hole unless you have too much pressure! Its not coming out the vent when you have the plug out right? If its coming out the hole, how do you know its not still rising after you put the plug back in? It could just keep rising to the vent if the seat isn't low enough to let the needle contact it when the float rises(of coarse). No need to put the plug back in until you get fuel to stop coming out the hole.
You are turning the large nut clockwise while holding the slotted screw stationary aren't you? At least I think thats the right direction. Its been awhile.
Sorry if I'm coming across with a little bit of a frustrating tone.
04-01-2013 11:14 AM
PatM Unless the engine is mounted upside-down, or your gauges measure bar instead of PSI, this is all I have left. . . . . "You might want to try an underwater bubble test looking for defects in the float bowl or very small leakage paths through the seated valve. Remember, with the engine running, a very small amount of leakage can be accomodated by the engine's demand for fuel. With the engine not running, any leakage will result in fuel slowly trickling out through an open sight glass." . . . .or the bowl vent.


Edit -- N and S is not registering.
04-01-2013 06:54 AM
wildb Ok,,,new update. Put the avenger back on, another new n & s. Installed mechanical fuel pump, hoping to suck through in tank pump. put gauge inline before carb. went to crank engine without electric pump running. gauge reading 3psi. fuel out vent tubes. ?????????? i'm lost now. 2 different carbs, 2 different pumps, floats, n & s's, adjustments. Any ideas???
03-31-2013 11:04 AM
wildb Happy Easter All...
03-30-2013 05:19 PM
wildb ( not sure if it would make a difference, but all testing & carb problems have been without the truck running. waiting to break in cam.)
03-30-2013 03:50 PM
wildb PatM,
just swapped out carb with working Edelbrock. double check fuel press with 3 different gauges. 3psi at reg exit. pinched by pass hose to see if working. press jumped to +10psi. unpinch press back to 3psi. hooked fuel line to 2nd carb., turned on pump, fuel coming out of vents.
i am working about to have a bald spot on my head from scratching it about this deal...

i thank you for all your input.
i am baffled at the moment....have a cold beer on me & thanks
03-30-2013 03:16 PM
PatM WildB

Sorry, I thought you had the 12-803b regulator. From what I see the 12-803bp is preset (hence the p?) at 7 PSI. Is it the adjustable regulator with the pressure simply pre-adjusted to 7 PSI? I'd have thought that any adjustment would've been locked out, but I'm not acquainted with this particular regulator.

With your finger lifting the float, clearly you could easily exert much more pressure on the valve's sealing surface than the float (on gasoline) would be able to exert. You might want to try an underwater bubble test looking for defects in the float bowl or very small leakage paths through the seated valve. Remember, with the engine running, a very small amount of leakage can be accomodated by the engine's demand for fuel. With the engine not running, any leakage will result in fuel slowly trickling out through an open sight glass.

03-30-2013 01:51 PM
wildb PatM
not sure about the spring, 2 different gauges tell me 3psi. tested bowl off of carb, ran 5psi air thru fuel inlet, pushed float up gently, needle shut off air flow as soon as it seated.
don't know what else to try. leaning towards flaw in bowl. going to try buddies carb, we'll see what happens. i will let you all know.

this site is great! been reading thru it for a long time, found lot's of help here.
you guys are what it's all about. awsome help. thanks much!
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