7.3 vacuum leak? - Ford Truck Enthusiasts Forums

Notices
Australia Chapter Join Chapter , Leader: ChunderDownUnder

7.3 vacuum leak?

Reply

 
 
 
  #1  
Old 10-03-2014, 09:18 PM
Blue7.3's Avatar
Blue7.3
Blue7.3 is offline
Posting Guru
Thread Starter
Join Date: Aug 2014
Location: Australia
Posts: 1,776
Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.
7.3 vacuum leak?

Well every time i start the truck the vacuum pump starts up , is this normal or am i chasing a vacuum leak?
How long does the vacuum stop in the reservoir for on your truck?
How long have you left the truck for, and started it up after a long period and the pump hasn't started?
I've fitted new knuckle seals and hub seals and vacuum solenoid.
 
Reply With Quote
  #2  
Old 10-04-2014, 01:27 AM
Aussie BrianB's Avatar
Aussie BrianB
Aussie BrianB is offline
Senior User
Join Date: May 2013
Location: Adelaide
Posts: 387
Aussie BrianB has a good reputation on FTE.Aussie BrianB has a good reputation on FTE.
Originally Posted by Blue7.3 View Post
Well every time i start the truck the vacuum pump starts up , is this normal or am i chasing a vacuum leak?
How long does the vacuum stop in the reservoir for on your truck?
How long have you left the truck for, and started it up after a long period and the pump hasn't started?
I've fitted new knuckle seals and hub seals and vacuum solenoid.
I've had mine of the road for a few months and when I pulled a vacum line off the reservoir a few days ago there was a his of air rushing in.
It seems that mine holds vacum for months so it sounds like you got a leak somewhere.
Good luck, not going to be easy to trace.
Hope it aint behind the dash amongst the heater stuff.
 
Reply With Quote
  #3  
Old 10-04-2014, 02:36 AM
SSSimon
SSSimon is offline
Posting Guru
Join Date: Apr 2010
Location: Canberra Australia
Posts: 1,163
SSSimon has a great reputation on FTE.SSSimon has a great reputation on FTE.SSSimon has a great reputation on FTE.SSSimon has a great reputation on FTE.
When I switch my truck on I hear the vacuum pump come on. After a minute to so it cycles off and doesn't come back on again.

There is also a similar sound as the fuel pump builds up pressure. This also stops after a minute or so. I have a fuel pressure gauge and can see that the fuel pump switches off when the pressure in the fuel bowl gets to 60psi (4 bar on my metric gauge).

If your vacuum pump comes on and remains on for longer than a few minutes or 3, I think you're up for chasing a leak!
 
Reply With Quote
  #4  
Old 10-04-2014, 05:30 AM
Blue7.3's Avatar
Blue7.3
Blue7.3 is offline
Posting Guru
Thread Starter
Join Date: Aug 2014
Location: Australia
Posts: 1,776
Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.Blue7.3 has a great reputation on FTE.
Nope sound like i'm okay , when i start up the pump cycles and turns off after a couple of minutes, but it does this every time i start up over night.
 
Reply With Quote
  #5  
Old 10-08-2014, 11:01 PM
SSSimon
SSSimon is offline
Posting Guru
Join Date: Apr 2010
Location: Canberra Australia
Posts: 1,163
SSSimon has a great reputation on FTE.SSSimon has a great reputation on FTE.SSSimon has a great reputation on FTE.SSSimon has a great reputation on FTE.
The tell tale sign of a vacuum system leak is that the heater flow will stay on demist no matter what the control is set to.
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
xjcamaro89
2004 - 2008 F150
431
Today 06:12 AM
Blue7.3
Australia Chapter
21
08-12-2015 10:19 PM
schaerem
1999 - 2003 7.3L Power Stroke Diesel
16
11-13-2014 01:09 PM
CATANG MOTORSPORTS
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
10
09-21-2008 10:48 AM
my4604x4
1999 - 2003 7.3L Power Stroke Diesel
5
09-03-2008 07:52 AM


Thread Tools
Search this Thread
Quick Reply: 7.3 vacuum leak?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.