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Topic: Low air pressure - dash front air gauge (Read 795 times) previous topic - next topic

Low air pressure - dash front air gauge

Before I began my last trip, the dash front air gauge would not go over 40 pounds.  The dash rear gauge was normal at 110 pounds.  I was unable to detect an air leak. Before I departed, I made a call to the service department at MOT and was told that it should not be a problem and that it would be safe to continue my trip.  During the trip, the dash front gauge would move between 15 and 40 pounds. The reading on the dash rear air gauge stayed over 100 pounds.  Everything seemed to function normally.  Any suggestions on what might be the cause of this problem and how to repair would be appreciated. 
Thanks,
Russell Jinks
2001 36' U295

Re: Low air pressure - dash front air gauge

Reply #1 –
A bad guage, most likely.
The selected media item is not currently available. Dave Head & Megan Westbrook
Titusville, FL - The Great Outdoors
'98 270 buying this month
Toad is a 2018 F150 XLT

Re: Low air pressure - dash front air gauge

Reply #2 –
Russell,

What air pressure readings front and rear have you had up until this time?  Said another way, from what (low) cut in PSI to what (high) cut out PSI have you been running?

Brett
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Low air pressure - dash front air gauge

Reply #3 –
It is simple to install a T with the electric aur gauge, add a mechanical gauge beside it for a double check.
On my 01 320, both Pri and Sec tanks are visable from the right front wheel position.  Would use a good (Tuff) quality mechanical gauge

Re: Low air pressure - dash front air gauge

Reply #4 –
Hi Russell,
I could be a pressure sender gone bad,a corroded electrical connection to the sender or wiring to it (sender applies ground). Take the wire off the sender - see if it has 12 VDC with ignition key on. Test voltage on the other sender too. You also could swap senders, sender connections or the gauge connections to see if the problem follows a swap.

Jim
2002 U320
Quote
Before I began my last trip, the dash front air gauge would not go over 40 pounds. The dash rear gauge was normal at 110 pounds. I was unable to detect an air leak. Before I departed, I made a call to the service department at MOT and was told that it should not be a problem and that it would be safe to continue my trip. During the trip, the dash front gauge would move between 15 and 40 pounds. The reading on the dash rear air gauge stayed over 100 pounds.  Everything seemed to function normally. Any suggestions on what might be the cause of this problem and how to repair would be appreciated.

Thanks,
Russell Jinks
2001 36' U295
Jim Frerichs
2002 U320 42'

Re: Low air pressure - dash front air gauge

Reply #5 –
The rear gauge cut in is about 95 psi and the cut out about 110 psi.  The front gauge is about 30 to 40 psi less than the rear and I don't recall it changing much.
Where is the sender located?
Russell Jinks
2001 36' U295
 

Re: Low air pressure - dash front air gauge

Reply #6 –
Russell,
Senders are on the tanks.
Quote
The rear gauge cut in is about 95 psi and the cut out about 110 psi. The front gauge is about 30 to 40 psi less than the rear and I don't recall it changing much.
Where is the sender located?
Russell Jinks
2001 36' U295
Jim Frerichs
2002 U320 42'