Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 11, 2025 ...

FRONT PRESSURE GAUGE READING 155 PSI AND RISING

July 23, 2017, 11:16:01 pm

The front cockpit air gauge has always read about 10 PSI higher than the rear, but after installing a new Bendix air regulator/governor and air dryer canister on the engine four months ago, the cockpit air gauges read the following maximums:

- 155 PSI Front, and slowly rising, pegged high
- 125 PSI Rear, and steady

Is the front gauge defective?
Is it a coincidence that the front gauge reading has become higher after the governor was replaced?

Quote Selected

Re: FRONT PRESSURE GAUGE READING 155 PSI AND RISING

Reply #1 – July 23, 2017, 11:20:42 pm

I think I would try swapping the air lines at the gauges to see if the readings followed...
Don

Quote Selected

Re: FRONT PRESSURE GAUGE READING 155 PSI AND RISING

Reply #2 – July 23, 2017, 11:21:47 pm

Probably a bad gauge (if mechanical) or bad pressure sender (if electric).  There no way you can have that differential between the front and rear tanks at compressor cut-out.  They are both fed by the wet tank, and all three are at the same pressure the instant the compressor cuts out.

Try swapping air hoses on (mechanical) gauges, or wires on (electric) gauges.  See if the high reading moves to the other gauge.

Quote Selected

Re: FRONT PRESSURE GAUGE READING 155 PSI AND RISING

Reply #3 – July 25, 2017, 04:36:38 pm

Just connected another pressure gauge to the auxiliary air outlet connector, used for tire inflation. It confirmed the higher-reading gauge is bad. We are camping at the big Oshkosh airshow, so I guess we'll live with it until we return home. I would regret cracking an air line behind the instrument panel with little resources to fix it.

Quote Selected