Can you log onto the web interface of your cable modem and report the signal levels? We had issues for years where it would be fine and just go poof. After about a year of calling twice a week they sent a crew out and they cut every connector off of every wire and replaced them, looked, and were it is fine now. Um it was always fine til it was not. And they were no sooner gone when the signal went away yet again. Months later they sent another guy, on his own, to shut me up, and he looked and found the issue in about 30 seconds and I am not kidding. They had a heavy wire wrapped around the cable where it met our eave and the nail they had it tied to pulled out so the cable was bent at a sharp 90 degree angle and sometimes the ends pressed together and sometimes not. He ran a new wire from the pole to the house but he did not have a bucket truck so it was on the ground, he was going to come back in a week or so to fix it. Two weeks later I called and he was no longer with them. It took and I am not kidding two years to get the wire back up in the air. They came out and fixed it and like a month later Verizon ran Fios out here and we have not looked back. Oh, the old company began with Z and ended with O as is O star reviews for their service.

I have actually been in your shoes, had a battery totally croak on they way out on a trip and yes, sure you can, if they catch you and want to be asses they can turn off your pump. I figured it is easier to apologize than get permission so I just did it and no one nuked my pump. Even if they do, you get what you get til they do, and they may be nice but I suspect policy is not to so if asked they will say no, On the flip side, if they are crowded they also do not want a disabled car clogging a pump. Just do it, even more so if it is a place you will not be back to.