I am in the process of replacing my vacuum pump. I will post pictures later. Caught it before the thing killed the engine. I should have noted that the door locks were not working like they used to (starting about 8 months ago), then lost all vacuum.

But I was thinking about an electric pump. I can get a 12V pump that puts out 20 lbs of vacuum. Is that going to be enough for the power brakes and anything else I need?

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NC Benz
Fuquay-Varina, NC
1979 300D
1983 300D Turbo 260,000 Miles
1984 300D Turbo 345,000 Miles (sons car)
OBK #31
1998 Ford Expedition 5.4l (fer Haulin'!) 145,000
1973 19' SeaRay with 115 Mercury TOWER OF POWER!
Club Car Golf Cart 36V
Ex toys:
1967 Mustang 289 (First Car)
Fiat 124TC
1975 Honda CVCC
1980 Audi 5000 Turbo

Do you mean inches of vacuum? The 123's need between 18-23" of vacuum.

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Oppps My bad. Yes inches. So 20" **should** work then.

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NC Benz
Fuquay-Varina, NC
1979 300D
1983 300D Turbo 260,000 Miles
1984 300D Turbo 345,000 Miles (sons car)
OBK #31
1998 Ford Expedition 5.4l (fer Haulin'!) 145,000
1973 19' SeaRay with 115 Mercury TOWER OF POWER!
Club Car Golf Cart 36V
Ex toys:
1967 Mustang 289 (First Car)
Fiat 124TC
1975 Honda CVCC
1980 Audi 5000 Turbo

Yup. You'll have to make a blocking plate. Lots of folks have asked about an electric vac pump so try some searching to find more info.

Also you may have an issue with the volume of vac being pulled. If it can't pull 20" in a large diameter hose you'll have an issue.

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I was thinking about taking the roller bearing and attached pin out for the pump would not be active - that would be my "plate".

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NC Benz
Fuquay-Varina, NC
1979 300D
1983 300D Turbo 260,000 Miles
1984 300D Turbo 345,000 Miles (sons car)
OBK #31
1998 Ford Expedition 5.4l (fer Haulin'!) 145,000
1973 19' SeaRay with 115 Mercury TOWER OF POWER!
Club Car Golf Cart 36V
Ex toys:
1967 Mustang 289 (First Car)
Fiat 124TC
1975 Honda CVCC
1980 Audi 5000 Turbo

That would work too.

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Here is a Thread from several weeks ago. The subject comes up ounce in a while. A new unit that is made for the job cost as much as a new Vacuum Pump.
Vacuum Pump Thread:
electric vacuum pump?

If you decide to buy a new one you need to take some time and find the thread where the Member Installed a new Vacuum Pump and that ne pump got destroyed quickly. It was due to too much end play in the Timer Bushings.

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84 300D, 82 Volvo 244Gl Diesel

Here is the thread concerning a new Vacuum Pump damaged by too much Timer end play.
second vacuum pump, help! on a trip-Toronto

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84 300D, 82 Volvo 244Gl Diesel

Do not forget it has to miantain that level of vacuum with some air flow from varius components or leakage.

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2010 ML350 Bluetec
2012 Mustang Convertible

I forgot to add Electric Vehicle sites (EV) where people convert or make their own EVs have some info on Electric Vacuum Pumps for the Brake Booster.

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84 300D, 82 Volvo 244Gl Diesel

If you decide to buy a new one you need to take some time and find the thread where the Member Installed a new Vacuum Pump and that ne pump got destroyed quickly. It was due to too much end play in the Timer Bushings.[/QUOTE]

"Timer Bushings", thats the word I was looking for

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"