Fuel Pump?
 

I have a 2001 Blazer Extreme. I am wondering if my fuel pump is a problem. It never wants to start on the first try, I crank it for a couple seconds, let off & go again. On the 2nd or 3rd crank it fires right up. The gas gauge also drops from time to time and will stay below empty for a bit then pop back up,this especially happens if its below a quarter tank. It also hesitates when I get on it. I have put new plugs,coil,wires,fuel filter,spider,distributor cap and nothing has fixed the problem. I dont mind putting new stuff on cause I get to play in the garage for a while with no hassles but would like this problem fixed. I have a K&N airtake and flowmaster exhaust if that helps. Has anyone else had this problem. I am thinking it has to be the pump.

Sounds like it but how is the pressure? Does it bleed off? Hook should chime in here soon with the how to.

I haven't and am not sure how to check the pressure

Rear of the fuel lines by the firewall there is a shrader valve. Go to autozone and ask for a test kit. Turn the key on no start wait till pump stops priming then turn key off. Watch note pressure. Note pressure after 5 mins.

i think you're right about the fuel pump. When i try to start mine in the morning it has trouble unless i cycle the ignition once. Mine needs a new pump.

I changed the pump this weekend and was most definitely the problem and wow what a difference. Blazer is purring now

Sweet!