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Unread 07-19-2014, 09:42 PM   #1
WindKnot
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Using Power Brake Vacuum For Fuel Evap Canister

I don't have power brakes. Moving the vacuum source for the Evaporative Canister to the Power Brake port would clean things up a lot.

Can anyone think of a reason not to go this route?

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Unread 07-19-2014, 10:04 PM   #2
JeffreyCharles
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Not having a means of purging the evap canister? Or is it already gone?
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Unread 07-20-2014, 12:35 AM   #3
bruteboy
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it may cause driveability issues as it would act like a vac leak when purging. it should be tee'd into the pcv line.
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Unread 07-20-2014, 04:40 AM   #4
Mike Romain
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The purge is just looking for manifold vacuum so that should work fine as long as the trigger is still ported.
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Unread 07-21-2014, 08:35 AM   #5
WindKnot
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Thanks guys. I looked again and then I was "inspired" to look at the FSM to see what it said. (well, duh, dummy! ) You guys are right, all it wants is a vacuum source.

It wasn't set up correctly when I bought it. In fact the fuel return line had somehow disappeared as well. Since I'm rebuilding and considering a future move to FI I want to restore the return line. The Evap was there but the original air cleaner was gone and the purge hose wasn't hooked up to anything.

The book says originally the purge hose was just hooked into the air cleaner horn; it doesn't require that much of a vacuum at all. I think you're right in that although the power brake port would establish the vacuum, the airflow might be too large and cause problems.

Thanks for the sounding board.
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Unread 07-21-2014, 09:03 AM   #6
Mike Romain
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Quote:
Originally Posted by WindKnot View Post
Thanks guys. I looked again and then I was "inspired" to look at the FSM to see what it said. (well, duh, dummy! ) You guys are right, all it wants is a vacuum source.

It wasn't set up correctly when I bought it. In fact the fuel return line had somehow disappeared as well. Since I'm rebuilding and considering a future move to FI I want to restore the return line. The Evap was there but the original air cleaner was gone and the purge hose wasn't hooked up to anything.

The book says originally the purge hose was just hooked into the air cleaner horn; it doesn't require that much of a vacuum at all. I think you're right in that although the power brake port would establish the vacuum, the airflow might be too large and cause problems.

Thanks for the sounding board.
You have the old fashioned canister then with no purge valve on it. It would cause a vacuum leak for sure if hooked to manifold vacuum. I have seen folks just drill a hole in the snout of the intake and solder in a copper tube at right angles to the airflow for picking up the purge line. They flared the end of the tube so it fit tight in the hole from the top. Even an epoxy like JB weld would likely hold the tube in place, but solder would be best.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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