Vapor Lock ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**mikey531** · 07-25-2009, 06:37 PM

Another issue I had was it didn't want to start after sitting for about 20 to 30 minutes. I finally got it going by pumping the gas and then holding it to the floor and it started. I know I need to rebuild the carb and I will probably get a phenolic spacer, anymore things I should do ? Thanks!

Jacfourteen · 07-25-2009, 06:49 PM

Mine had a similar problem until I adjusted the floats, it seems they were set too high so when I shut it off the fuel would overflow and flood it out. While you are working on the carb you might as well check it out. Hope this helps.

68gmsee · 07-25-2009, 07:39 PM

Yeah, sounds like it's flooding.

Next time don't pump the gas pedal. Just push it all the way down and leave it down while cranking to see what happens. If it starts easier that way it's an indication of flooding.

On the other hand, if you actually have to pump the pedal to get it started, it may be the floats are adjusted too low, or you could be leaking gas out of the float chamber. Either way, a good cleaning and carb kit should resove the issues.

neonlarry · 07-25-2009, 09:00 PM

If you still have a Q-Jet when you do the rebuild make sure you epoxy the well plugs or better yet put in the newer solid well plugs. These are notorious for leaking causing either flooding or emptying the fuel bowl or both.

07-25-2009, 06:37 PM	#1
mikey531 Senior Member Join Date: Jul 2009 Location: Exeter, NH Posts: 791	Vapor Lock ? Another issue I had was it didn't want to start after sitting for about 20 to 30 minutes. I finally got it going by pumping the gas and then holding it to the floor and it started. I know I need to rebuild the carb and I will probably get a phenolic spacer, anymore things I should do ? Thanks!

07-25-2009, 06:49 PM	#2
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Vapor Lock ? Mine had a similar problem until I adjusted the floats, it seems they were set too high so when I shut it off the fuel would overflow and flood it out. While you are working on the carb you might as well check it out. Hope this helps. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

07-25-2009, 07:39 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Vapor Lock ? Yeah, sounds like it's flooding. Next time don't pump the gas pedal. Just push it all the way down and leave it down while cranking to see what happens. If it starts easier that way it's an indication of flooding. On the other hand, if you actually have to pump the pedal to get it started, it may be the floats are adjusted too low, or you could be leaking gas out of the float chamber. Either way, a good cleaning and carb kit should resove the issues.

07-25-2009, 09:00 PM	#4
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Vapor Lock ? If you still have a Q-Jet when you do the rebuild make sure you epoxy the well plugs or better yet put in the newer solid well plugs. These are notorious for leaking causing either flooding or emptying the fuel bowl or both. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI



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