The AMC Forum : No fuel pressure and Dry Primary bowl http://theamcforum.com/forum/ This is an XML content feed of; The AMC Forum : V8 Engine Repair and Modifications : No fuel pressure and Dry Primary bowl Wed, 22 May 2013 15:26:16 +0000 Sun, 15 Jul 2012 19:04:39 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 10.03 360 theamcforum.com/forum/RSS_post_feed.asp?TID=40316 The AMC Forum http://theamcforum.com/forum/http://www.theamcforum.com/forum/skin_images_amc/forumheader.png http://theamcforum.com/forum/ No fuel pressure and Dry Primary bowl : Good to hear you stayed with it... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376345.html#376345 Author: FuzzFace2
Subject: 40316
Posted: Jul/15/2012 at 7:04pm

Good to hear you stayed with it and got it fixed Thumbs Up
Dave ----
]]> Sun, 15 Jul 2012 19:04:39 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376345.html#376345 No fuel pressure and Dry Primary bowl : YeeeHaww!!!! I think we're... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376340.html#376340 Author: tmancusi
Subject: 40316
Posted: Jul/15/2012 at 6:53pm

YeeeHaww!!!!  I think we're back in business!  She ran at idle (750rpm) for about 5 minutes, gas level in the sight glass was about 1/3.  Thank you guys!!!!  Could not have done it without yours or my brother Tony's help.  (Yeah, I know there's an exhaust leak....Confused)









]]> Sun, 15 Jul 2012 18:53:09 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376340.html#376340 No fuel pressure and Dry Primary bowl : FuzzFace2 wrote: PHAT69AMX... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376259.html#376259 Author: tmancusi
Subject: 40316
Posted: Jul/15/2012 at 3:20pm

Originally posted by FuzzFace2 FuzzFace2 wrote:

Originally posted by PHAT69AMX PHAT69AMX wrote:


On the needle & seat, the Screw is the "Lock" and the Nut adjust the needle in the bowl.

Once adjusted, tighten the screw to lock the needle in place in the bowl.

Avoid screwing the needle too far into the bowl because if ya do

the flats inside the nut will no longer have contact on the flats on the needle

and it will no longer be able to adjust the needle in and out of the bowl.

If this happens remove the gasket from the Nut and it may then be able

to once again contact the flats on the needle and back it out of the bowl.

 

Beyond that sometimes the Float Arm needs tweaked to midrange the

needle and seat adjustment in the tapped hole in the bowl

but that is seldom the case.
Did you adjusted it as per PHAT post, the nut is used for the adjustment the screw is a jam or lock. Also as he said maybe the tang on the float needs to be tweaked? I would turn the bowl & float assy. upside down to see if the adjustments do any thing.
I have never had a float adjustment not work on a Holley carb.

Dave ----



O.K., I'm dumb. I simply didn't have the adjustment screw backed off enough. That's what I get for trying to do this while keeping an eye on my 2 kids playing in the front yard. Once the 4 yr old is done with his nap I'll try to fire it up.]]> Sun, 15 Jul 2012 15:20:56 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376259.html#376259 No fuel pressure and Dry Primary bowl : PHAT69AMX wrote: On the needle... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376232.html#376232 Author: FuzzFace2
Subject: 40316
Posted: Jul/15/2012 at 2:14pm

Originally posted by PHAT69AMX PHAT69AMX wrote:

On the needle & seat, the Screw is the "Lock" and the Nut adjust the needle in the bowl.
Once adjusted, tighten the screw to lock the needle in place in the bowl.
Avoid screwing the needle too far into the bowl because if ya do
the flats inside the nut will no longer have contact on the flats on the needle
and it will no longer be able to adjust the needle in and out of the bowl.
If this happens remove the gasket from the Nut and it may then be able
to once again contact the flats on the needle and back it out of the bowl.
 
Beyond that sometimes the Float Arm needs tweaked to midrange the
needle and seat adjustment in the tapped hole in the bowl
but that is seldom the case.
Did you adjusted it as per PHAT post, the nut is used for the adjustment the screw is a jam or lock. Also as he said maybe the tang on the float needs to be tweaked? I would turn the bowl & float assy. upside down to see if the adjustments do any thing.
I have never had a float adjustment not work on a Holley carb.
Dave ----
]]> Sun, 15 Jul 2012 14:14:51 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376232.html#376232 No fuel pressure and Dry Primary bowl : Well, did a little more investigation... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376207.html#376207 Author: tmancusi
Subject: 40316
Posted: Jul/15/2012 at 12:38pm

Well, did a little more investigation today.  There was a small piece of plastic in the float adjustment screw, kind of like some plastic wrap.  I'm guessing this shouldn't be in there?



I'm also having a problem understanding how the needle and seat work.  No matter how much I adjust the float screw, the float bowl has full movement.  It wasn't like this a couple of weeks ago.  New one from the rebuild kit does the same thing.  These pics are with the screw adjusted all the way down so the float shouldn't move.  What am I missing?





Here's the original adjustment screw:



Thanks.


Edited by tmancusi - Jul/15/2012 at 12:40pm]]> Sun, 15 Jul 2012 12:38:12 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post376207.html#376207 No fuel pressure and Dry Primary bowl : The float adjustment won't... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374993.html#374993 Author: Lucas660
Subject: 40316
Posted: Jul/10/2012 at 7:16pm

The float adjustment won't make any difference if the needle and seat has worn, I would remove the bowl, replace the power valve, needle and seat and check that the float does not have a hole in it by dropping it in a jar of fuel. Replace the fuel filter upon re-assembly.]]> Tue, 10 Jul 2012 19:16:03 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374993.html#374993 No fuel pressure and Dry Primary bowl : I'm really confused.... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374735.html#374735 Author: tmancusi
Subject: 40316
Posted: Jul/09/2012 at 8:34pm

I'm really confused.  No matter how I adjust the float, whether I set it visibly higher or lower in the sight plug, the gas level never gets below covering the 3/4 of the sight bowl.  Even after I get it to run for a minute or 2.  It almost seems to run better with the float visibly almost to the top.  Isn't that too much gas?  Maybe the PV did go bad from the flame spit the other day?

If all this isn't bad enough, my new alternator has stopped charging Dead.  Sounds like the belt is slipping.  Hopefully I just need to tighten.  

I have a headache.

Thanks again for all the help guys.....I'll get it eventually.


Edited by tmancusi - Jul/09/2012 at 8:36pm]]> Mon, 09 Jul 2012 20:34:23 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374735.html#374735 No fuel pressure and Dry Primary bowl : Float is most likely too high... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374715.html#374715 Author: Lucas660
Subject: 40316
Posted: Jul/09/2012 at 6:25pm

Float is most likely too high now. Adjust it back down 1/4 of a turn at a time and remove the sight plug to check when it is running, the fuel should be just licking the bottom of the threads.]]> Mon, 09 Jul 2012 18:25:36 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374715.html#374715 No fuel pressure and Dry Primary bowl : So got home from work, tried to... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374700.html#374700 Author: tmancusi
Subject: 40316
Posted: Jul/09/2012 at 5:57pm

So got home from work, tried to adjust the primary float without the car running, 'cause it won't hold an idle. After making an adjustment I start it up and holy crap it idles beautifully!!!......for about 45 seconds, then stalls and won't start again. I'm sure it's flooded now. Question is why did it stall?]]> Mon, 09 Jul 2012 17:57:29 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374700.html#374700 No fuel pressure and Dry Primary bowl : The primary float could be lowered... http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374681.html#374681 Author: PHAT69AMX
Subject: 40316
Posted: Jul/09/2012 at 4:14pm

The primary float could be lowered by loosening the primary needle Screw
and turning the needle nut clockwise maybe 1/2 or so turns while holding the screw.
On the needles the Screw is just a "lock" and the Nut screws the Needle in and out of the bowl
to adjust the float level and resulting fuel level in the fuel bowl.
Then remove the float level site screw and see if gas still runs out.
 
Other than the float level itself, it could also maybe be the O-Ring on the Needle & Seat.
If the spirit moves ya, could remove the front bowl from the carb.
Unscrew the Needle & Seat from the Bowl to inspect or replace the O-Ring.
I lube the O-Ring with wd-40 before putting the needle back in the bowl.
They make Nylon Needle & Seat gaskets now that a lot better than the blacl paper ones.
If using black paper ones, I soak those with wd-40 also.
A bowl screw head flange can be use to dry-set the float level.
With the fuel bowl inverted, adjust the needle and seat in and out
so that the bowl screw head flange just slides between the top of the float
and the inside top wall of the fuel bowl, this is usually a pretty close dry float setting.
 
On the needle & seat, the Screw is the "Lock" and the Nut adjust the needle in the bowl.
Once adjusted, tighten the screw to lock the needle in place in the bowl.
Avoid screwing the needle too far into the bowl because if ya do
the flats inside the nut will no longer have contact on the flats on the needle
and it will no longer be able to adjust the needle in and out of the bowl.
If this happens remove the gasket from the Nut and it may then be able
to once again contact the flats on the needle and back it out of the bowl.
 
Beyond that sometimes the Float Arm needs tweaked to midrange the
needle and seat adjustment in the tapped hole in the bowl
but that is seldom the case.
 
Once the float is adjusted, one way to "test" for a blown Power Valve diaphram
is while running at idle, screw in the mixture screws all the way.
If the PV is good this should kill the engine at idle.
If the PV is ruptured, it will keep idling with the mixture screws in all the way.


Edited by PHAT69AMX - Jul/09/2012 at 4:17pm]]> Mon, 09 Jul 2012 16:14:38 +0000 http://theamcforum.com/forum/no-fuel-pressure-and-dry-primary-bowl_topic40316_post374681.html#374681