96 gmc suburban 1500. when i turn the key it tries to start but wont. if i hold the pedal turn the floor and turn the key it starts after 10-15 seconds. once started it will run but when i shut it off it has trouble starting again. i have new fuel pump and gas filter in it.i only run it a weekends in the summer for the beach and when it snows. Other than that it sits.

okay this schematic shows that you've a fuel pump relay~

https://www.google.com/search? q=96+gmc+suburban+1500+fuel+pump+relay

....an undervoltage condition from a BAD ground can cause this relay to fail...you must take the main 1/0 battery cable off of the chassis ground and wire brush the lug and the chassis to allow a full three hundred cold cranking amps thru that and still unwavering 12 volts for the ECM and auxilliary devices such as fuel pump, igniition....headlights windshield wipers etc~~

Judge it could still be a relay even it starts?

welll it could be "stuck on" where you could not shut your car off~

okay we are talikin' about the fuel pump relay?....bad boy be dead...the ignition relay could have you not be able to shut it off or never come on~ either would be compromised with an undervoltage condition~

hey Judge but i think its a Hot cranking problem not Cold cranking. it will start only if i hold the pedal to the floor. if i turn the key and just pump the gas pedal it will just try to start. same thing if i just turn the key it just tries to start.like i said pedal to floor turn key and after like 10 sec it starts.

I have the same problem it only starts when it's hot outside and when it's cold it will not start at all can anybody help me?