Is vacuum tank needed on rabbit diesel w/o a/c ? ? ? ?

[doonboggle]

I've removed all of the factory installed a/c system and parts from my pickup. 

I have been taking other parts off for purpose of cleaning and/or replacing if need be when rotted, broken, cracked, etc.  One of these is the vacuum reservoir-tank that fits beneath the radiator.  In seeing it as needing to be replaced, put ads out seeking a replacement.

Today got a nice response from someone who says that the diesel rabbits did not use the tank, since the injection pump creates it's own.  Advised him of my factory a/c system, so he may not be aware of the need for that system.  Am awaiting further input from him.

In the meantime, what say members on the forum.  Without a/c, is a vacuum tank needed on a diesel rabbit?

Thanks

[calebessent]

As far as I know, the injector pump doesn't create any vacuum. There is a vacuum pump mounted where a distributor would be on a gasoline engine, to the right of the injector pump. It has a fat hose going to the brake booster.

That's as far as my knowledge goes. I've needed to troubleshoot my own vacuum system since I bought the car, but the Bentley doesn't mention it, or I can't find where it does. My brake pedal sure is stiff. I'm not familiar with the reservoir under the radiator, and my car also has A/C.

Bump for help.

[8v-of-fury]

your 81 pickup will use the vacuum to operate where the air is flowing to inside the cabin.. Ie. feet, defrost, or middle vents.

There will be no need for a vacuum canister.

[GEE-BEE]

JUST TAKE THE VAC IT OFF THE T FITTING FROM THE VAC PUMP/ BOOSTER LINE...

MY AAZ HAS TWO NIPPLES ON THE HARDLINE...

DONT FORGET THE 2.5 MM HOSE

G.B.

[calebessent]

The vents are controlled by vacuum? Is this why I can't turn off the air to my feet?

[8v-of-fury]

yup.. however with no vacuum applied it should be stuck on defrost all the time.

[doonboggle]

Slightly different configuration, but that's what I 'had' ... as 'in no more'.

Thanks to those that advised I did not need the tank.  Just save me some $$.

yup.. however with no vacuum applied it should be stuck on defrost all the time.

[maxfax]

The vac reservoir is generally for the gassers.. However some Benz diesels to use them..  Of course everything on those cars work off vacuum

  Since the vac system works off manifold vacuum on gassers, when you have the engine under load there isn't any manifold vacuum.. The tank acts as a buffer so that all the vent doors don't go changing around while going up a hill or red light racing.. The diesel pump makes a pretty constant vac supply, that increases with RPM so no need for the extra weight... 

Nothing like ascending a mountain in an old car with vacuum wipers..