Forum Discussion
subcamper
Aug 08, 2015Explorer II
If your van is a pre-OBDII emissions vehicle, then you should be OK.
I think OBDII started in 1996.
If your van is OBDII compliant, then any attempts to tap off the gas tank will probably set a "slow evap system leak" code or even a "large evap system code".
These systems basically pressurize the fuel tank slightly and then measure the pressure continually to see if any leaks are occurring. A tap-off somewhere in the system (gas tank or filler neck) will bleed off pressure and set the code.
It might be possible to put a shutoff valve in the tap-off so that you can turn it off when the engine is running. Of course, this means not running the generator while the van engine is running.
Steve
I think OBDII started in 1996.
If your van is OBDII compliant, then any attempts to tap off the gas tank will probably set a "slow evap system leak" code or even a "large evap system code".
These systems basically pressurize the fuel tank slightly and then measure the pressure continually to see if any leaks are occurring. A tap-off somewhere in the system (gas tank or filler neck) will bleed off pressure and set the code.
It might be possible to put a shutoff valve in the tap-off so that you can turn it off when the engine is running. Of course, this means not running the generator while the van engine is running.
Steve
About Technical Issues
Having RV issues? Connect with others who have been in your shoes.24,369 PostsLatest Activity: Mar 11, 2026