where is the fuel pump relay/fuse on a 2000 GMC Sierra 5300 Engine?

[missileman49]

my gmc sierra cranks but won't start.ran once for 20 sec..and died, now it just cranks.

 

[Molson02536]

my gmc sierra cranks but won't start.ran once for 20 sec..and died, now it just cranks.

The relay is in the fuse/relay box in the engine compartment, but start with the simple and replace your fuel filter if there is no check engine light. A dirty and clogged fuel filter will cause the issues your having or a weak fuel pump.

The fuel pump as a expected life of about 150,000 miles and anything longer then that is borrowed time. In short, replace your fuel filter and check the fuel pressure at the shredder valve, should be Engine VIN Z 335-375 (48-54 psi) and 5.3L VIN T 385-425 kPa (55-62 psi)

Keep us posted.