93 S10 Blazer. Has original fuel pump. 113k miles.

Here it hasn't gotten to really freezing temps yet especially at night. So even in mild temps around 50-60's the Blazer has become hard to start in the mornings.

It didn't have this problem last winter. I've had the truck almost 3 years and it's never failed to start on the first try and has always started almost instantly.

But now it takes about 10-15 minutes of turning key on, waiting for fuel pump to activate, turning key off and repeat 3-4 times. Sometimes it will start to fire and then I have to wait a few minutes, turn key on and off as described and keep doing this and eventually it will start.

Now, once it starts and even if it just runs a minute or two and doesn't completely warm up, if I turn the ignition off, it will start right back up with just a bump of the key like it has in the past. Even if the truck sits for an hour after only running a minute or two, it will start right up. Only after sitting 2+ hours does it have the issue of not wanting to start.

Plugs, wires, rotor cap and button is about a year old.

Now it develop a problem this past summer that makes me think it may be the fuel pump. During the hottest days, like 95-100 deg. the truck sometimes would not start AFTER running awhile. I deliver mail part time so it does a lot of start go running. Sometimes when I have to get out and turn the engine off, it would not start until it sat for about 15 minutes. And the fuel pump (assuming it's the fuel pump, noise came from rear of vehicle), would make a loud whirring/buzzing type noise. I thought it could be vapor lock since stopping and going heats up the vehicle more than straight driving.

So, any suggestions?

 

probably seems dumb but how old is the battery? i know i had a hard time starting my 94 when it was cold and i needed a new battery

 

No, that's a good thought. But the battery is about 6 months old. 800cca I think. The engine turns over very fast.

But now that you mention electrical, could it possibly be the coil? It has the original coil. But again, it starts immediately after it's ran for a minute or two (or longer).

It would seem a weak fuel pump or coil would still make it difficult to start the truck even after it warms up.

But I don't know

 

thats not dumb its possible a weak battery would make it take longer to start

these battery's dont like the cold especially when there old

 

We posted at exactly the same time 1:31pm LOL

Yes I agree, but the battery is only 6 months old and still has a hard time starting in 55-60deg weather (first time starting of the day). Then after that as mentioned above, you just have to bump the starter and it starts.