1985 nissan 720 king cab ST question?

[snakecbaker]

I’m looking at replacing the stock carburetor with a WEBER 32/36 and deleting the vacuum lines because it doesn’t not need to pass emissions. Was wondering if this would interfere with the heating and air conditioning? And if not maybe some one can tell me witch ones I need to keep and were they are located.

[85NIS720]

You can delete most of them, leaving a few, and it should work just fine. It won't run very smoothly though, but check out the 720 moderator(PEZi720) and I'm sure he can help you out.

[bracktheron720]

well i can tell you that pezi's truck as well as mine and a ton of other ones on here only one vac line it runs from the base of the carb (weber or not) to the dizzy for the vac advance...oh and one for the brakes..if im wronge please chime in lol..but the heat and A/C part idk..my heater works fine with just the one line but i dont have A/C so...cant help ya there as far as not running smooth most will tell you that deleting all the old cracked lines made theres run better mine started stronger and had much more throttle response after gettin rid of them..

[PEZi]

the heat is based off of the intake manifold where the water flows... not the vac lines around the carb. the AC is also a separate entity running from the AC compressor to and from the cab.

deleting the actual vac lines around the carb will not hurt either the heat or AC

the only vac line you need, as stated above, is the one to the dizzy for vac advance... all others can be removed and capped. the brake booster i don't personally consider a vac line simply because of its size... nor the PCV.... both of these are on the manifold itself, not the carb

removing them all will help the truck run smoother, and in most cases allow for a bit more performance even on the stock carb, but the gas mileage does suffer a bit

the weber will run better overall, also with slightly lower mileage but is less of a headache in the long run

[snakecbaker]

thanks for all the help iam new to nissan and datsuns so iam still learning iam use to american muscle v8 and not the 4cyclinders

[flinterman2000]

Was wondering if this would interfere with the heating and air conditioning?

If there is a vac idle up for the AC then this is needed. Check to see if any vac solenoid is connected to the throttle linkage. This would be the one to keep.