With it not starting sometimes, you may look at the coil. Not much information given here, so this is a blind guess. You didn't give make or model or year, or mileage. But the coil is a common problem on many cars.
SOURCE: HARD STARTING ONLY WHEN WARM
Drive this thing until hot and when
you shut it off, open the hood and find the vacuum hose that goes to
the fuel pressure regulator. It will be on the drivers side of engine
on the fuel rail. It's a little round vacuum diaphragm with a hose to
it. Pull this hose off and see if gas leaks out the little nipple of
the regulator. I'll bet it's leaking and what is happening is that it's
flooding out the engine after it's off for an hour or more.
These are
fairly easy to replace since they are on the outside of plenum. Just be
VERY careful as to look at the new one before removing the old one.
Check location of the retainer clip, if it is not on right the
regulator can pop out and you will have a major leak!!! Also be sure to
remove the old O-ring and screen from the rail, they tend to stay in
there when you pull the regulator off. You won't be able to get new one
in if old parts are left in the rail.
SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....
try replacing your EGR Valve, or your Oxygen Sensor
SOURCE: 2000 s10 Blazer dies very 3-6 weeks for no reason
i would check your ignition system. you would need a meter for this but look for broke or loose connections. if it was a fuel problem i dont think it would just start up after 20 minutes. or you might try your ignition switch. if its shorting or something then ya well it would cut your engine off real quick
SOURCE: 2000 blazer , every once in a while it wont
Hi:
The fuel pumps on the Chevy blazer and their full sized trucks are prone to failing, as I had to change mine on my 1996, and yours is the same model .
Ours started off intermittently dieing, then failed all together. If you have matched up the fact that you have no fuel pressure when your blazer won't start, then the fuel pump is the most likely suspect. As you know, they are not cheap, and the fuel tank is not difficult to remove, but needs to be close to empty to make the job managable. The tank is over 3 feet long, and is better removed with 2 people if you can find help.
SOURCE: runs fine til the temp out gets hot enough then dies
you didn't say if it was hot on the temp gauge? no matter, it sounds like you have a stuck t-stat. when the engine is cold, a mechanical valve keeps the water from coming out of the engine block until warmed up, then opens and lts the cooler water in. this cools down the engine and the colder temp of the water shuts the valve again. this happens constantly while the engine runs, and if your t-stat is stuck, the engine heats up the water in the block, but with nowhere to go, simply overheats the motor. a good repair book will locate the thermostat housing for you and should you the repair procedure. (i assume you have checked the water in the rad. low water will give you same symptoms). good luck.
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