vacuum pump/vacuum booster

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Jan 15, 2011 | 11:32 AM

mark vanford

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vacuum pump/vacuum booster

how do i test a vacuum pump and vacuum booster? i have hooked up a vacuum gauge to the the line coming from the pump @ the distribution manifold and with the engine running i have 26.5 inches of vacuum. when i turn the engine off ,i lose all vacuum in about 45 seconds. is this normal? should the vacuum hold for a extended period of time? any info is appreciated. thanks mark p.s. i have an e 350 van ,1985,with a 6.9 diesel.

Last edited by mark vanford; Jan 15, 2011 at 11:34 AM. Reason: add more info

Jan 15, 2011 | 01:02 PM

ArdWrknTrk

pedant

Joined: Jan 2008

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From: EXTREME southwest CT

There should be a check valve at the brake booster inlet.
Otherwise vacuum should 'disappear' with the engine off.
(at least this is true with gas engines, but there is nothing driving the pump with a diesel either)

Jan 15, 2011 | 06:05 PM

bashby

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From: Charles Town, W bygod Va

sounds normal to me. You should be able to pull the check valve out of the booster and tell if its been holding vacuum. It should hold for days, if not you could have a leaky booster or check valve.

Oct 13, 2024 | 10:39 PM

BrokenF250

3rd Gear

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Ok does anyone have the numbers of a new vacuum pump for an 88-94 IDI 7.3 Ford F250 ???????

Oct 14, 2024 | 12:26 AM

BigBlue2

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Quote:

Originally Posted by BrokenF250

Ok does anyone have the numbers of a new vacuum pump for an 88-94 IDI 7.3 Ford F250 ???????

Rockauto.com still has vacuum pumps for your application. If you are looking for an OEM vacuum pump number to source an OEM pump good luck. You might be able to find one. Your best bet is to search by application and see what's out there.