Quote:
Originally Posted by rickpaw
Thanks Carl for chiming in. In all occasions when the pressure dropped, the tank was at /2 mark, in fact it happened after we filled the tank. I'm very certain that the pump was submerged in fuel the whole time. The pumps are new. First one had 600 miles. The 2nd one has 400 miles.
I'm going to switch the pump over to a mid 90s Chevy pick up pump. That way I can get replacement at local part store. In MS, I walked into the local part store and asked for a walbro or an aeromotive pump, and they had no idea what I was talking about.
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As a suggestion, check your required fuel pressure. If your thinking about going to a mid 90's TBI pump, I'm not sure that would work, as they are 15-18 lb. pumps. The LS engines require almost 60lbs to work properly. I think the later year 96-98 chevy truck "vortec" had more fuel pressure than the TBI engines did, but how much more I'm not sure.
I'm not a fuel system expert by any means, but have you checked your tank venting? Seems like a long shot, but could this be a venting issue, causing a pump to overheat? Sometimes the biggest problems have the simplest fixes.