How to test for a Vacume

[Simon 1867]

I was wondering if anyone can tell me how i can test to see if im getting vacume from my vacume pump... its a 1.2 st engine

Thanks

[AlexW]

Fuel pump? or the vaccum advance?

[dhdev (Oli)]

Pull the pipe off with the engine running and stick your finger over the end, should soon tell if it's 'sucking'

[Rich]

or a miti-vac will give you a reading. Think thats what they are called, might just be a brand name

[mowgli]

to test if the vacuum advance retard mechanism in the distributor is working, simply pull the vacuum pipe off at the carb end & suck it. if the engine noise changes, then the mech works. if it doesn't then the mech diaphragm is broken.

[Simon 1867]

Tryed the test mowgli....the engine note didnt change. Thing is its a new dizzy and vaccum pump. can you still get new vaccum pumps

[mowgli]

if the vacuum advance didn't work, then the 'new dizzy' should be returned for a refund.....

i don't know if gm do the part any more, i haven't had a delco dizzy since 1992