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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

351 vacuum lines...please help

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Old Aug 12, 2018 | 09:39 AM
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351 vacuum lines...please help

I've swapped in a 351 in place of my 300 six and am trying to sort out the vacuum lines. The 351 is from a '95 F250 (automatic) which I've swapped into my '94 with an M5OD, 28 oz flywheel, F250 ECM (5 speed) and so on. There are green, white, and yellow plastic vacuum lines and they are connected to solenoids. I'm trying to use both Chilton's and Haynes manuals but still need help. From what I can figure, the green line goes to the EGR. There is a red line and that's supposed to go on the FPR. That's where I need help from you guys...I've tried the search feature but have had no luck either.
 
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Old Aug 12, 2018 | 12:11 PM
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Do you have a blue line ?
The FPR line usually goes directly to the Vacuum Tree from the FPR.

Green line to EVP Solenoid - EGR sounds right.

Red line usually goes to the Vacuum Canister.
 
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Old Aug 12, 2018 | 12:18 PM
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No blue. Green, yellow, white, light pink and red.
 
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Old Aug 12, 2018 | 12:28 PM
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Are the vacuum lines from the 300 or the 351?

Do you have a vacuum canister?
 
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Old Aug 12, 2018 | 12:32 PM
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Do you have a map sensor ?
What color line is going to your MAP, and where does it go?
 
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Old Aug 12, 2018 | 01:00 PM
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Originally Posted by vjsimone
Are the vacuum lines from the 300 or the 351?

Do you have a vacuum canister?
351 and I bought a new F250 plastic vacuum canister and got rid of the "coffee can" vacuum canister....

Originally Posted by vjsimone
Do you have a map sensor ?
What color line is going to your MAP, and where does it go?
Black and it's hooked up to the manifold vacuum "tree"

"
 
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Old Aug 12, 2018 | 01:11 PM
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Originally Posted by frank5079
351 and I bought a new F250 plastic vacuum canister and got rid of the "coffee can" vacuum canister....
"
Where is your vacuum canister connected ?
 
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Old Aug 12, 2018 | 01:33 PM
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Where is your vacuum canister connected ?
Standing from the passenger fender the right side is hooked directly to the manifold tree. The left side is hooked to a hose which in turn is hooked to the connector that holds the green, yellow, white, and light pink lines, and is connected to the white line.
 
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Old Aug 12, 2018 | 01:44 PM
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Originally Posted by frank5079
Standing from the passenger fender the right side is hooked directly to the manifold tree. The left side is hooked to a hose which in turn is hooked to the connector that holds the green, yellow, white, and light pink lines, and is connected to the white line.
If you can photo that connector, would be nice to look at.

So, if that red line you were speaking of is about a foot long, that would be about the length nessicary to go from the FPR directly to the Vacuum tree.

You can also run a new line from the FPR to the Vacuum Tree......
 

Last edited by vjsimone; Aug 12, 2018 at 01:52 PM. Reason: Adding text
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Old Aug 12, 2018 | 01:51 PM
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If you can photo that connector, would be nice to look at.

So, if that red line you were speaking of is about a foot long, that would be about the length nessicary to go from the FPR directly to the Vacuum tree.
Yup. One of the guys from the f150forum.com board sent me this....



and this helps...
 
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Old Aug 12, 2018 | 01:54 PM
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I forgot to mention that I have removed the air(smog) pump as well as the TAD and TAB and plugged the pipe that connects the left and right heads in the back with a same sized pipe cap. I guess I need to plug the yellow and pink lines...
 
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Old Aug 12, 2018 | 01:56 PM
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Yeah, Steve is a great resource...
I see you have deleted your smog stuff...
 
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Old Aug 12, 2018 | 02:08 PM
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Originally Posted by frank5079
I forgot to mention that I have removed the air(smog) pump as well as the TAD and TAB and plugged the pipe that connects the left and right heads in the back with a same sized pipe cap. I guess I need to plug the yellow and pink lines...
I would follow those yellow and pink lines back to the source and plug / cap them there, adventually those lines are going to crack and leak.
So, just disconnect them from the TAD/TAB solenoids and cap the solenoid connection.
 
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Old Aug 12, 2018 | 02:10 PM
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Are you using the Computer and MAP from the 1995 Truck ?
 
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Old Aug 12, 2018 | 02:24 PM
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If you have access to the truck that the 351 came out of, photo the Vacuum Diagram under the hood.....
 
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