02 ZR2 S10 wont start

Does it have a security guard/immobilizer/auto theft detterent device? Your truck probably thinks you're stealing it and giving you a hard time. If this is not the case: Check for spark at the plugwire while cranking it over-do you have spark.

I would start with checking battery connections at both ends. How can you say that your fuel pump relay went bad with such a total lack of supplied information. The fuel pump relay only primes the fuel system for 5 seconds when you first turn the key on or off. It is the oil pressure switch that runs the fuel pump when the engine is running. Even with a bad fuel pump relay, you could crank it over for 20 seconds and the oil pressure switch would kick in the fuel pump from just the battery cranking making the oil pressure switch.[/quote:aea2823df2] Techman Reading it tells me you know your fuel system circuitry in/out damn good explanation right on the benjamins. The fuel pump relay only primes the fuel system for 5 seconds when you first turn the key on or off. It is the oil pressure switch that runs the fuel pump when the engine is running. Even with a bad fuel pump relay, you could crank it over for 20 seconds and the oil pressure switch would kick in the fuel pump from just the battery cranking making the oil pressure switch. In an accident the oil sending unit will kill the fuel pump-No oil pressure the contact opens in it. Here's the prove