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This is entirely normal, a fuel pump will run only for a few seconds so that it is primed. If it ran continuously without the engine running pressure would build up inside it and would probably cause damage. After if has run for a few seconds after the jey is first turned it will , basically, switch off and wait for a signal from the sensor, communicating that the engine is cranking at whick point it resumes pumping in order for the engine to start.
Remember, the spark and fuel must coincide in the combustion chamber in order for there to be ignition, if you have no spark that may be the issue.
You can check whether fuel is getting to the plugs by cranking over repeatedly and quigkly removing a plug. If the pump is supplying fuel the end of the plug may have some fuel at the tip or may smell of petrol/gas.
You have to find out why fuel and spark are not coinciding essentially, in the combustion chamber.
not the computer what is going on is that the fuel cut off solenoid when you switch to lp / reg gas either lost its voltage and it not opening and also check the air gap at the top of the mixer head on the throttle body and this!! info comes from a man with 40 years in LP gas installer with a class 10 licence on LP and natural gas servicing and repairs >>ME!
check trasmisson fluild level if it is full check to see if it ssmells burnt if it smells like onions and is brrown then the filter may be plugged and the fluid is burned so you will have to replace it. however most likely it needs to be rebuilt snd tork converter replaced. hope this helps.
Try pounding on the gas tank with a rubber mallet or similar tool. (careful not to dent the tank) Try starting it. If it runs, replace the fuel pump (it's nfg). I've diagnosed numerous fuel pumps this way. Remember the pump needs to be replaced, if you drive it, you don't know when it'll fail for good. Hope this helps. Please post the results.