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Re: 94 rodeo engine problems
Sounds like headgasket issues to me; this would account for the overfill on the dipstick, though the next day when the dipstick is dry doesn't make sense to me.
At that age and those many miles, you're probably in need of a major coolant system overhaul if it's never been done, i.e. thermostat, new hoses, possibly new radiator (they've typically spent their lives by about 160k miles), waterpump and such.
The waterpump could be a big factor if it's original as well as the thermostat.
Are you rechecking the oil IMMEDIATELY after shutting the truck down and/or immediately after pouring more in, if so, you're not allowing it time to drain back into the bottom of the pan for an accurate reading - thus your dipstick would read low. You need to wait 15-20 minutes after shutting off the truck and/or pouring more oil in and recheck the level after adding 1qt at a time.
If you're having to add more then 1qt twice a week, you've got a serious issue; i.e rear main seal leak or some other major oil leak under the truck.
No, the oil pump has nothing to do with robbing your engine of oil.
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