"Is it safe to recharge the battery without disconnecting the leads or
will I fry the ecu?"

I'm no expert though that has never stopped me from offering an opinion.
Unless you've got some very odd old-school battery charger that has
sufficient grunt to push the voltage on the battery up to an
electrolyte-boiling level, the ecu won't be bothered by the charging
voltage.

--
Jack "Rocket j Squirrel" Elliott
1984 Westfalia, auto trans,
Bend, Ore.

On 01/04/2014 01:22 PM, Robert Stevens wrote:
> How about putting a container of Sta-Bil in the gas tank?
>
> http://www.goldeagle.com/brands/stabil/
>
> Bob
>
> On Jan 4, 2014, at 2:08 PM, David M <covrambles@YAHOO.COM> wrote:
>
> My van is laid up after failing the emissions test three times. It
> will be out of commission for a while so I am starting the van and
> running the engine weekly and I also need to keep the battery topped
> up. Is it safe to recharge the battery without disconnecting the
> leads or will I fry the ecu? Also, how long before the gas goes bad.
> Its 4 months old now and the van still starts but I'm very concerned
> about it. The tank is about half full. I cannot drive the van as the
> registration has expired and I need the emissions certificate to
> register it.
>
>
> David (1987 Wolfsburg, Tempe AZ)
>