'97 chevy suburban diesel,only cranking but not starting,no security light when ignition is switched on(all other lights come),can hear clicking sound at lhs foot well,fuel pump is pumping but no starting.please advice thanx

I would start with checking the fuel flow at the filter. Twist open the bleed valve on the top of the filter while you are cranking the engine. If fuel is squirting out, then you are getting fuel past the filter. now you will check the injectors to ensure they are getting fuel. You will need a couple of wrenches to break open the line. You can start with the easies ones to access on the driver's side. Be sure you hold the injector tight while you break the line loose from the top. Just loosen it 1 or 2 turns. Crank the motor and see if you are getting fuel to the injector. If you are getting fuel to the injectors, then we have eliminated a fuel problem.

Are your glow plugs cycling correctly? Every time the 6.5 diesel prepares to start, the glow plugs will cycle. The first time the engine is turned on after it has completely cooled off, they will cycle for 10-20 sec depending on the air temp. That clicking sound bothers me like the relay switch for the glow plugs isn't working. How many miles on truck? Have the glow plugs been changed? Has the relay switched been replaced?

The last area to check will be the air intake system. Pull the air filter housing open and remove the filter. Ensure it is clean and no debris got past it and is obstructing the air to the turbo. (My brother had a filter come apart and plug up the turbo.) Don't buy cheap air filters!

Hope this helps. Let me know if you have any further questions.

I have a 94 K1500 6.5 turbo with 282,456 miles on it. Runs like a champ. Out pulls my new Ford.

Russ