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08-11-2007, 08:14 PM
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#1 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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Vac guage problem
I installed a vac guage and connected it to a tee on the back of the intake. I fired up the engine and the needle buried at 30. I put another guage I had on the front and it was 20-22. Do I need to move the vac line to the front of the carb?
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RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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08-11-2007, 11:44 PM
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#2 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Vac guage problem
Bad gauge-manifold vacuum will real the same anywhere below throttle blades.
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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 |
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08-12-2007, 11:32 AM
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#3 |
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Born Psycho
 
Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,903
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Re: Vac guage problem
sounds like the guage is shot.
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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08-12-2007, 12:47 PM
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#4 |
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Senior Member
Join Date: Jan 2005
Location: Raleigh, NC
Posts: 894
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Re: Vac guage problem
Ditto, you'll never get 30 in of vacuum!
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-Chris Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid. Also building a 1950 Willys CJ-3A and off-roading a 2001 Nissan Frontier on 1-Ton Portals... |
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08-15-2007, 01:02 AM
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#5 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,335
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Re: Vac guage problem
Ok got it fixed. I had to calibrate it. I must have bumped it when I installed it. Guage started out at 25.
 Its back to 0 and when I fire up the truck its showing about 22 when first started up then 19-20 in gear.
__________________
RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 |
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