Vacuum pump on '97 Ford 7.3 diesel

doorman · Oct 17, 2016

How many "inches" of vacuum should this pump pull? Thanks for any help.

mattwillson · Oct 17, 2016

It should around 20" give or take a bit.

Bob · Oct 17, 2016

As a side note, I don't know exactly what issue you are having, but those trucks used a "tomato juice can" vacuum reservoir mounted on the LH fender liner, and if it gets a hole rusted in it the system can't build vacuum for the brakes and heater.

doorman · Oct 17, 2016

thanks, will check vacuum at pump.

Dick2 · Oct 17, 2016

The can that Ford used was so light that the ends of the can would flex and eventually crack around the seam so the vacuum would leak. I went to a store, bought a can of tomato juice, punched a hole in the center of one end and drained the tomato juice. I soldered a fitting into the end and attached the vacuum hose. No more leak as the metal in that can was twice as thick as the original Ford can. Ford wanted $36 for a new can 25 years ago; probably higher now. The tomato juice was also good.

Vacuum pump on '97 Ford 7.3 diesel

doorman

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mattwillson

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Bob

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doorman

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Dick2

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