The GAS won't stop AHHHHHHHHH!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67chevemall · 04-29-2005, 08:21 AM

I put a rebuilt holley 4150 on a week ago and can't get the fuel to stop
pouring out of the sec. bowls? I have the check plug out trying to
adj. the bowls but nothing will stop it. I took the bowl off to see if I left
something out but it all looks good. What could this be?
It will run with fuel pouring out the sec. check plug at a fast rate
but the truck burps and farts bammmmmm bammmm. I'll end up blowing the
truck up if I keep this up.

**'70_402** · 04-29-2005, 12:14 PM

I Had This Same Problem And I Sent The Carb Back To Holley And They Sent Me A New One..

67chevemall · 04-29-2005, 12:21 PM

This is a early 70's carb that I really want to work. Everything looks good I
can't see why the gas won't stop.
I temped to get a fitting and disconnect the secondary and try it.

jhow66 · 04-29-2005, 12:32 PM

You have got a piece of dirt of lint (or something of the like) between your needle tip and needle seat. It only takes a very ,very small speck. Screw your needle all the way out and wash out and blow dry with air hose.

71cadc10 · 04-29-2005, 01:38 PM

also might want to try and set your float level with the secondary bowl on the bench, before you put it on the carb. That should get you fairly close. I know with center hung, you set it with the bowl upside down, and center the float. With Side Hung, I'm not 100% sure but the Holley website has the info I'm sure.

67chevemall · 04-29-2005, 04:11 PM

Set it on the bench? Maybe my bowl isn't striaght.
I'll take it back off and check. Also I'll search the holley site.
Thanks

muddbugg72 · 04-30-2005, 12:25 AM

take your needle seat out and clean it out. with your bowl off and upside down there should be about 1/2 in. gap between top of bowl and float. you can use a 1/2 in. drill bit to get the clearance. hope that helps.

67chevemall · 05-02-2005, 07:40 AM

muddbugg thanks for the tip it worked my bowl was bent down to far.
Now it runs with no leaks but is back fireing like crazy.
I thought it was the acc pump so I backed it off all the way disconnecting it.
But it still back fires I tlooks to be wet in the primarys????

RON WOODGEARD · 05-02-2005, 09:46 AM

Quote:

Originally Posted by 67chevemall

muddbugg thanks for the tip it worked my bowl was bent down to far.
Now it runs with no leaks but is back fireing like crazy.
I thought it was the acc pump so I backed it off all the way disconnecting it.
But it still back fires I tlooks to be wet in the primarys????

I told you this over a week ago...

Hotrodhenryj · 05-02-2005, 10:47 AM

The backfiring is caused by a blown power valve. This is a common Holley problem. They make one now to replace it, you can buy it at Napa. Good luck

67chevemall · 05-02-2005, 03:45 PM

So 1 or 2 backfires and your powervalve is blown. Cause it must have done that
20 times bing ping bam!

Now that my floats are good I should be able to replace the power valves and be on
my way. I hope.

? How do you know they are blown is there a test? Or should I replace both of them.

cduster · 05-02-2005, 05:09 PM

If it were me, I'd replace both of them. Holleys are bad for the power valves blowing when it backfires. One little pop is enough to bast one of them.

Dan

cableguy0 · 05-02-2005, 05:33 PM

do yourself a favor and by the power valve blowout protection kits summit and jegs both have them they are a little check ball that you install that stops the power valve from getting blown out

Hotrodhenryj · 05-02-2005, 06:10 PM

Yea, what they said!

67chevemall · 05-02-2005, 11:18 PM

I will get them 4 sure.. I want to .. bla bla
Never mind.
I am tring a 78 Q jet right now but the fn fuel line filter white donut gasket on the
main line is done.
Search for one tomorrow.
2 learn more I should be able to run both 20 minutes apart.

8

RON WOODGEARD · 05-03-2005, 12:37 AM

Quote:

Originally Posted by 67chevemall

I will get them 4 sure.. I want to .. bla bla
Never mind.
I am tring a 78 Q jet right now but the fn fuel line filter white donut gasket on the
main line is done.
Search for one tomorrow.
2 learn more I should be able to run both 20 minutes apart.

8

I'm not sure what 20 minutes apart mean, But there is some very Informative Holley books on the Market, And if you are going to play with them Buy all you can afford, Yes, You will get some of the same stuff from each one, But most of these tech. writers have little tid bits Inclusive to their manual,(Book).

04-29-2005, 08:21 AM	#1
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	The GAS won't stop AHHHHHHHHH!!!! I put a rebuilt holley 4150 on a week ago and can't get the fuel to stop pouring out of the sec. bowls? I have the check plug out trying to adj. the bowls but nothing will stop it. I took the bowl off to see if I left something out but it all looks good. What could this be? It will run with fuel pouring out the sec. check plug at a fast rate but the truck burps and farts bammmmmm bammmm. I'll end up blowing the truck up if I keep this up. __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

04-29-2005, 12:14 PM	#2
'70_402 Senior Member Join Date: Dec 2003 Location: Pampa, Texas Posts: 1,553	I Had This Same Problem And I Sent The Carb Back To Holley And They Sent Me A New One.. __________________ https://www.ebay.com/itm/29620574751...mis&media=COPY

04-29-2005, 12:32 PM	#4
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	You have got a piece of dirt of lint (or something of the like) between your needle tip and needle seat. It only takes a very ,very small speck. Screw your needle all the way out and wash out and blow dry with air hose. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

04-29-2005, 01:38 PM	#5
71cadc10 Registered User Join Date: Apr 2004 Location: Boiling Springs, PA Posts: 435	also might want to try and set your float level with the secondary bowl on the bench, before you put it on the carb. That should get you fairly close. I know with center hung, you set it with the bowl upside down, and center the float. With Side Hung, I'm not 100% sure but the Holley website has the info I'm sure. __________________ 71 C10 long bed, 2003 6.0L, 06GTO E40, T56, 12bolt 4.10 rear

04-29-2005, 04:11 PM	#6
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Set it on the bench? Maybe my bowl isn't striaght. I'll take it back off and check. Also I'll search the holley site. Thanks __________________ 1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD

04-29-2005, 12:21 PM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	This is a early 70's carb that I really want to work. Everything looks good I can't see why the gas won't stop. I temped to get a fitting and disconnect the secondary and try it.

04-30-2005, 12:25 AM	#7
muddbugg72 Registered User Join Date: Sep 2003 Location: port allen louisiana Posts: 207	take your needle seat out and clean it out. with your bowl off and upside down there should be about 1/2 in. gap between top of bowl and float. you can use a 1/2 in. drill bit to get the clearance. hope that helps.

05-02-2005, 07:40 AM	#8
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	muddbugg thanks for the tip it worked my bowl was bent down to far. Now it runs with no leaks but is back fireing like crazy. I thought it was the acc pump so I backed it off all the way disconnecting it. But it still back fires I tlooks to be wet in the primarys????

05-02-2005, 10:47 AM	#10
Hotrodhenryj Truck Farmer Join Date: Nov 2001 Location: Lake Havasu City, Arizona Posts: 1,192	The backfiring is caused by a blown power valve. This is a common Holley problem. They make one now to replace it, you can buy it at Napa. Good luck __________________ Arizona rust free sheetmetal

05-02-2005, 03:45 PM	#11
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	So 1 or 2 backfires and your powervalve is blown. Cause it must have done that 20 times bing ping bam! Now that my floats are good I should be able to replace the power valves and be on my way. I hope. ? How do you know they are blown is there a test? Or should I replace both of them.

05-02-2005, 05:09 PM	#12
cduster Registered User Join Date: Oct 2002 Location: S.W. Michigan Posts: 403	If it were me, I'd replace both of them. Holleys are bad for the power valves blowing when it backfires. One little pop is enough to bast one of them. Dan __________________ Good Judgment comes from experience. Most experience comes from bad judgment. Last edited by cduster; 05-02-2005 at 05:11 PM.

05-02-2005, 05:33 PM	#13
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	do yourself a favor and by the power valve blowout protection kits summit and jegs both have them they are a little check ball that you install that stops the power valve from getting blown out __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

05-02-2005, 06:10 PM	#14
Hotrodhenryj Truck Farmer Join Date: Nov 2001 Location: Lake Havasu City, Arizona Posts: 1,192	Yea, what they said! __________________ Arizona rust free sheetmetal

05-02-2005, 11:18 PM	#15
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	I will get them 4 sure.. I want to .. bla bla Never mind. I am tring a 78 Q jet right now but the fn fuel line filter white donut gasket on the main line is done. Search for one tomorrow. 2 learn more I should be able to run both 20 minutes apart. 8



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