Thanks for the response. ---- Yes, I have a code reader and am clearing the code a couple of times a week. ---- I have done the visual but have found nothing. ---- If the system works on negatve preasure there must be a sensor that monitors that. How often would it take a reading and where would this sensor be located? The low fuel light always comes on when warmed up and idling for more than a minute. The check engine can code occassionally at the same time or whenever.

Back to my orignal plan then, I should be able to preasure up to a pound or pound and a half without doing any damage?

GW