if the check valve in the fuel pump is bad then there is nothing to stop the oil draining back to the tank,along with an air leak on a fitting can do that. By adding an inline timed delayed fuel valve and recheck your fittings, you can solve the problem without a new pump. you must lock out the cad cell for continuos priming without safety lock out. you may also consider a faulty tigerloop. it has happened.
kevin, April 2010
