I've been wracking my brain with this no start issue. '71 skylark 350 with a chevy truck quadrajet. I'm going to post pictures of how it's hooked up. However, when I turn my key, it cranks over and every 3rd or 4th revolution I hear it wanting to start. I can see fuel spraying into the carburetor when the accelerator pump is pushed in. Anyways, I really could use some input before I tear it's hood off with my bare hands. Mike the man.
For starters, you have the vacuum modulator plumbed into the manifold where the PCV valve is supposed to be, which isn't even a vacuum source! That's where the PCV valve draws crankcase vapors. The vacuum modulator thinks you're at wide open throttle full time. The hose just above it you have connected from the manifold to the carb's air horn is now just a built in vacuum leak, that port on the manifold is supposed to be the vacuum source for the modulator. Do you even have a PCV valve hooked up? Here's the 1971 Chassis Manual to get you started http://www.teambuick.com/reference/library/71_chassis/ Devon
I can't quite tell what you're talking about. I don't have, and haven't had a pcv valve since I bought this car 2 years ago. I have the original service manual but it doesn't show vacuum line routing. I'm still out of this world confused. Can you like, circle the problem zones on the pictures I attached and label them or something in paint? Lol. Mike the man.
Mike, I don't know if there is a "correct" way to plumb the chevy carb on the Buick. Do you have anyone nearby who can help out? Devon
Here goes nothing. Pic 1, pretty self-explanatory I hope. The big black grommet currently holding the steel tube is supposed to get the PCV valve. Pic 2 shows the 3/8" vacuum hose that is supposed to run from the front of the carb around the passenger side to connect to the PCV valve. A picture of the valve and hose is shown in the chassis manual on pages 60-55 and 60-92. Devon
The steel transmission kick down tube wont fit in the same hole that the deleted line is plugged into, I tried. I found a pcv valve on an old intake and connected it. My question now is, where does the emission canister plug into then? I know a guy nearby that will be able to help in the near future. Hopefully doing the pcv and deleting that one line on the rear of the carb will help it to start. Should I look for another fitting for the tranny tube and just cut the old one off? Mike the man.
What you need for the modulator connection is a fitting like this: http://www.outdoorpros.com/Prod/Dor...gs-Fuel-Hose-Fittings-(5-Pack)/49989/Cat/1291 The fitting screws into the intake. What you do is cut a 1" piece of vacuum hose, slip it over the end of the metal line, and plug it into the top of the above fitting ensuring a leak free connection.
I was thinking the exact process you described Larry. I'm going to take a video once it's running and beautiful Still wondering about the emissions canister line however. Mike the man.
That is a Chevy Q-jet you have there. The Buick and Oldsmobile, and maybe the Pontiac Q-jets have the fuel line come straight into the carburetor, not off to the side. In any case, the canister line is not important to the way the car runs. I'm not sure how they routed it in 1971, but in 1972, the canister had 2 lines going into it. One came from the fuel tank, and the other simply plugged into the air cleaner. In later years, there was a nipple on the carburetor. Again, I'm not sure about 1971, but you do not have the correct carburetor on it anyway.
I know I don't have the right carburetor. I've known it was a chevy carb since I got it. The only reason it's not a buick quadrajet is because it was free and I was broke. I'm going to use it anyways Thanks though. Mike the man.
OK, but again, the canister hose doesn't necessarily connect to the carburetor for your year (1971) car.
Wow, that is a sweet rubber fuel line running right over the distrubutor. Hope you got comprehensive on that car!
Hahahahahahahahahaaaa! It actually runs beside it and is temporary. The tubing bender I bought from sears sucks and I snapped my steel line. Mike the man.
