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Daves55Sedan · 10-30-2020, 06:20 PM

I have major doubts that the fuel pump vacuum booster is at fault, but checking is a good idea. Reason why I don't think it is the problem is because you still have normal engine vacuum (albeit flowing thru the booster) and feeding your accessories. You should still have plenty of vacuum to operate wipers and heater controls (unless or hose or component is faulty) as I pointed out previously.
Remember, not all engines were equipped with the dual action fuel pump to begin with.

10-30-2020, 06:20 PM	#33
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	Re: Heater no hot air from Heater? I have major doubts that the fuel pump vacuum booster is at fault, but checking is a good idea. Reason why I don't think it is the problem is because you still have normal engine vacuum (albeit flowing thru the booster) and feeding your accessories. You should still have plenty of vacuum to operate wipers and heater controls (unless or hose or component is faulty) as I pointed out previously. Remember, not all engines were equipped with the dual action fuel pump to begin with.