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Daves55Sedan · 10-30-2020, 06:14 PM

Tell ya what. There's a ton of ways to check the vacuum booster on the fuel pump. You could start the engine, throw a bucket of water on the windshield, turn the windshield wipers on and rev the engine with brake pedal depressed. If the wipers STOP when you rev the engine, the vacuum booster is shot.
Also, if I didn't mention it already, another easy way to check is to disconnect both lines connected to top of vacuum booster. Plug one side and use a MityVac (no need to have engine running for this test). Pump the MityVac trigger a couple times to reach a couple inches of mercury on the guage and hold it like that for a few minutes. If the guage does not drop to zero, the booster is likely good. Just don't exceed the maximum vacuum output of the booster or it might result in damage.

10-30-2020, 06:14 PM	#32
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: Heater no hot air from Heater? Tell ya what. There's a ton of ways to check the vacuum booster on the fuel pump. You could start the engine, throw a bucket of water on the windshield, turn the windshield wipers on and rev the engine with brake pedal depressed. If the wipers STOP when you rev the engine, the vacuum booster is shot. Also, if I didn't mention it already, another easy way to check is to disconnect both lines connected to top of vacuum booster. Plug one side and use a MityVac (no need to have engine running for this test). Pump the MityVac trigger a couple times to reach a couple inches of mercury on the guage and hold it like that for a few minutes. If the guage does not drop to zero, the booster is likely good. Just don't exceed the maximum vacuum output of the booster or it might result in damage.