Vaccuum Leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Low68 · 01-06-2003, 06:23 PM

has anyone heard of the vacuum line leaking right where it goes into the power booster? Is that fixable? It is really annoying. Thanks for the help.
Low68

Low68 · 01-06-2003, 10:32 PM

ttt

*Piston* · 01-06-2003, 10:55 PM

Leaking at the check valve? There's a rubber gromment and Check valve that can be replaced yes.

Longhorn Man · 01-07-2003, 01:17 AM

Your engine should run better after you fix this too.

wxman1 · 01-07-2003, 02:17 AM

I also had vacuum leaks when I first got my truck. Idle
was very rough. Replaced the vac line to the booster and
changed to a holley manifold that matched the 600 cfm holley carb
and the idle smoothed out significantly. So I'm assuming that the new vac line to the booster and the new intake manifold gaskets were
what did the trick.

Jim M.
Mt Juliet, TN

Low68 · 01-07-2003, 11:06 AM

I just put a new engine in, so it shouldn't be the manifold. Thanks for the idea. I can also hear it coming from right at the let for the booster. The thing I am talking about is the piece the hose hose presses on and the part that swivells in the booster. I can take a picture later. I don't know what it is called. Is that the check valve? Thanks
Low68

ChevLoRay · 01-07-2003, 11:47 AM

It's called a "CHECK VALVE" and it is available from NAPA stores. It isn't expensive. Get one. Easy installation, low maintenance. Never needs watering. It may or may not come with the grommet, but I believe it will have a new one. Install the grommet, THEN attach the check valve to the hose, and press the checkvalve end of the hose INTO the grommet. Presto, chango! You're done!

Happy Motoring!!!!

Longhorn Man · 01-08-2003, 12:15 AM

add a little spit to the rubber grommet if the check valve don't wanna go in very easily. Just don't let the little lady see you ...it'll look like your getting intimate with it, and our wives are already jelouse of our trucks as it is. :d

01-06-2003, 06:23 PM	#1
Low68 Registered User Join Date: May 2001 Location: Arizona Posts: 758	Vaccuum Leak has anyone heard of the vacuum line leaking right where it goes into the power booster? Is that fixable? It is really annoying. Thanks for the help. Low68 __________________ Build Thread

01-06-2003, 10:32 PM	#2
Low68 Registered User Join Date: May 2001 Location: Arizona Posts: 758	ttt __________________ Build Thread

01-07-2003, 11:06 AM	#6
Low68 Registered User Join Date: May 2001 Location: Arizona Posts: 758	I just put a new engine in, so it shouldn't be the manifold. Thanks for the idea. I can also hear it coming from right at the let for the booster. The thing I am talking about is the piece the hose hose presses on and the part that swivells in the booster. I can take a picture later. I don't know what it is called. Is that the check valve? Thanks Low68 __________________ Build Thread

01-07-2003, 11:47 AM	#7
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	It's called a "CHECK VALVE" and it is available from NAPA stores. It isn't expensive. Get one. Easy installation, low maintenance. Never needs watering. It may or may not come with the grommet, but I believe it will have a new one. Install the grommet, THEN attach the check valve to the hose, and press the checkvalve end of the hose INTO the grommet. Presto, chango! You're done! Happy Motoring!!!! __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

01-06-2003, 10:55 PM	#3
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,301	Leaking at the check valve? There's a rubber gromment and Check valve that can be replaced yes.

01-07-2003, 01:17 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Your engine should run better after you fix this too.

01-07-2003, 02:17 AM	#5
wxman1 Senior Member Join Date: May 2002 Location: mt juliet, tennessee, usa Posts: 237	I also had vacuum leaks when I first got my truck. Idle was very rough. Replaced the vac line to the booster and changed to a holley manifold that matched the 600 cfm holley carb and the idle smoothed out significantly. So I'm assuming that the new vac line to the booster and the new intake manifold gaskets were what did the trick. Jim M. Mt Juliet, TN

01-08-2003, 12:15 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	add a little spit to the rubber grommet if the check valve don't wanna go in very easily. Just don't let the little lady see you ...it'll look like your getting intimate with it, and our wives are already jelouse of our trucks as it is. :d



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