This morning truck turned the key, and nothing at all from the starter. Turned it agian, and it started after a lot of cranking. drove it to work, it ran fine, then I turned it off, and tried to start it again, it took two or three times of cranking to get the engine to turn over, it seemed like it was getting very little gas. Could my fuel pump be going out? Is there a way to test this w/o using a voltmeter or something? Could my fuel filtewr be so gummed up it is blocking part of the line?