[Chris90F250Diesel4x4]

Where the rubber line comes off the vacuum pump on my truck is less than an inch away from the exhaust manifold.
It burned a hole in the vacuum line which caused my brakes to go out. I got two 90 degree brass fittings and put short pieces of rubber hose in-between to try and keep the hose further away from the exhaust manifold but it is still close right where it comes off the vacuum pump. I also put 1200 degree spark plug wire cover material over the short rubber pieces to try to keep this from happening again. But it looks like the spark plug wire cover material is slowly deteriorating from the heat.
This problem occurred 6 months after my engine blew and I had it replaced with a 7.3 from an E350 Van. The mechanic who switched the engine took the vacuum pump off of my old engine and put it on the new engine out of the E350 Van.
Is it possible he could have mounted the vacuum pump the wrong way so that where the vacuum hose comes off the pump is closer to the manifold than it should be?

 

[chuckster57]

You put a van engine in your truck, right? The 7.3 with a single serpentine belt has the pump on top by the passenger side, with the vacuum hose going along the intake manifold. It's possible that the van has the pump on the bottom, and you may be able to move it.

I haven't looked at a van with that engine so I am just guessing.

 

[LMJD]

It's been re-routed wrong somewhere down the line. Not going to go out and look right now at mine, but it may go up the inner fender well near the battery then air conditioning unit, then to the firewall.

 

[chuckster57]

Is the pump mounted in a different spot depending on V belt vs. Serpentine belt?

 

[oldrebuiltdodge]

If I recall, the v-belt is on the passenger side under the alternator, and serpentine is driver side above the power steering, and below the A/C/

 

[LMJD]

If I recall, the v-belt is on the passenger side under the alternator, and serpentine is driver side above the power steering, and below the A/C/

Right, down low on the right side with V-belts.

 

[Bill1013]

View of engine front. Vac pump on the right, drivers side with Serp belt.
You have to tell us what year the original engine was and whether it was V-Belt or Serp belt.

 

[Chris90F250Diesel4x4]

The engine came out of a 1994 E350 cutaway. My truck is a 1990 F250. The vacuum pump on my truck is below the alternator & above the lift pump. It runs off a v belt that comes off a double pulley on the alternator.
The vacuum pump is in the same place as on the old engine. Just wondering if it could somehow be mounted differently so the output fitting on the vacuum pump isn't so close to the exhaust manifold. I don't know if it was that way on the old engine or not. I never noticed.

 

[Bill1013]

Your Vac pump should be clocked like this, with the suction facing up. Pic is from 89 manual, but as far as I know it should be the same way, the Vac circuit may not be the same.
If by chance the Vac pump is off of a Van engine, they are mounted on the drivers side and the suction tube would be facing down when mounted on the pass side.