The fuel pump on my 07 Cobalt 2.2 has just started to make strange noises. Basically it sounds like the pressure is constantly changing from 1 second to the next, like the pump keeps fighting to supply enough fuel. The problem is intermittent though, sometimes the pump still runs like it should, at a constant (and quiet) pressure. The car drives perfect either way, but something is clearly not right here.

I was just on road trip in some very remote areas up north where I had no choice but to fill up at some questionable looking gas stations, this is where I first heard the pump doing this. I'm thinking I may have just got some dirty gas which has clogged up the filter, giving the pump trouble maintaining a steady flow. If this is the case, a new filter will hopefully do the trick. The filter on there isn't old, but then one contaminated tank is all it takes.

Anyways, just thought I would check in here before I replace the filter again since it's not exactly cheap. Has anyone else had their pump do this before?

Thanks,
Andrew

 

Sound like your on the right track,it wont hurt to change it other than your pocket book.

 

Well, I just replaced the filter and no luck, still does the same thing intermittently. I was excited at first because it ran for close to a minute sounding perfect. I was 2500 miles from home when I first noticed this problem and it hasn't got any better or worse in all that time. I thought if the pump was on its way out it would have got worse by now, or died altogether. Is there some kind of pre-filter in the tank? Maybe something before the filter is plugged up?

 

Have you checked the lines or the pump itself?