91 Blazer won't start

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Dsteenbock - 20 Sep 2006 18:20 GMT

Hello all. I have a 91 S10 blazer with a fuel injected v6 that won't start.
I drove It home last night with no problems and this morning It won't start.
It will turn over, and start and sputter weakly then die right away. I
changed the fuel filter to make sure there was no blockage there, and I
think I can hear the fuel pump hum when I turn the key to on but i'm not
100% sure. One thing that I never noticed before was when i had the hood up
with the key on there was some sort of module making a constant, light
buzzing noise and there was an odd odor emanting from around the area.
I'm kinda stumped. I'm hoping It's not the fuel pump as It's In the gas tank
and thats too much for me to undertake. I'm thinking about changing the Oil
pressure switch such thats cheap and easy to try first.
Any ideas or input would be most welcome.

thanks

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jdl - 20 Sep 2006 19:45 GMT

Can you check the fuel pressure?

Where was that buzzing noise coming from, can you be more specific?

My info shows the pump relay to be underhood--driverside, on the firewall,
in relay block.

Were there any trouble codes? On some of these systems, the computer
monitors the voltage on the fuel pump circuit, no voltage when there
should be and the computer sets a code. I'm not sure about your model.

The oil pressure switch and pump relay, both, supply voltage to the fuel
pump, parallel circuits, One circuit fails, the vehicle still runs because
of voltage through the other circuit. If they're both faulty you have a
problem.

If you can rule out the fuel system, we can try something else.

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Dsteenbock - 21 Sep 2006 14:01 GMT

> Can you check the fuel pressure?

I dont have a pressure gauge, but I know a friend who does so I'll try to
borrow It. Question though, Is It still useful If I can't start It? Will
there be some residual pressure I can check?

> Where was that buzzing noise coming from, can you be more specific?

On the passenger side. It's mounted pretty much on the firewall. A small
silver module of some sort. I havn't bought a Haynes manual yet, I'm going
to pick one up today and find out what It Is.

> My info shows the pump relay to be underhood--driverside, on the firewall,
> in relay block.
[quoted text clipped - 9 lines]
>
> If you can rule out the fuel system, we can try something else.

I definately can hear something click on for a few seconds an then off when
I turn the key to the on position. I'm going to try to get someone to stand
by the gas tank and listen to see If thats where It's coming from.
thanks for the tips.

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Bassasasin - 21 Sep 2006 14:39 GMT

Are you getting spark..
IF not .. look in the distributor and change the module..

Bass

Signature

Bassasasin

http://www.automotiveforums.com

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Dsteenbock - 22 Sep 2006 15:50 GMT

> Are you getting spark..
> IF not .. look in the distributor and change the module..

I'm going to check the spark later today. I checked my fuses last night, and
theres a 3 Amp one labeled Crank. The fuse was very corroded and cracked, so
I replaced It, but the terminal Is also very corroded in the fuse block.
What does the crank fuse control?

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KjunRaven - 21 Sep 2006 00:29 GMT

> Hello all. I have a 91 S10 blazer with a fuel injected v6 that won't
> start. I drove It home last night with no problems and this morning It
[quoted text clipped - 11 lines]
>
> thanks

if you are really curious if fuel pump is running ; got to wiring at pump
and jump 12Vpos to gray wire in loom. that is input for pump voltage. if
you hear it running that still doesnt mean you have pressure as their is a
short hose splice between pump and plumbing inside tank that i have seen
fail many times in the last 25 yers...........spray starter fluid in
throttle body while cranking to figure out if its fuel starved.

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