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Old 09-25-2011, 08:53 PM   #1
jritch85
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1997 gmc k2500 cranks but won't start, need some help!

I have a 1997 GMC K2500 SLE with a Vortec 350 and a 4L80 automatic transmission. It has 140,500 miles on it. 14 bolt semi float for a rear end.

The truck will crank all day long but will not start. The idiot lights do not come on the dash and I can not hear the fuel pump buzzing. Everything else works (HVAC blower, lights, radio) except interior lights they never worked, except when you rock the dimmer switch.

I have checked all of the fuses and they are good.

I have 12.6 VDC running over to the power distribution block under the hood by the brakes.

I have all new connections on the battery cables.

Also I have just overhauled this motor about 500 miles ago and it has been running good up until now.

I don't know if this is related but I just filled up the tank.

I hope I have provided enough information.

THANK YOU GUYS FOR YOUR HELP.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 09-25-2011, 08:59 PM   #2
bluex
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Re: 1997 gmc k2500 cranks but won't start, need some help!

If you cant hear the pump running, it or the relay is bad. It could also be the oil pressure sender, but the pump should still prime.

Have/can you check the fuel pressure?
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Old 09-25-2011, 09:14 PM   #3
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Squirt a shot of starting fluid down its throat that will tell you if its ignition or fuel related.
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Old 09-25-2011, 09:28 PM   #4
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Another thing to add it did start when the dash lights came on.

I have been reading around that it might be the ignition switch. Anybody have any thoughts on that?
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 09-25-2011, 09:34 PM   #5
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by bluex View Post
If you cant hear the pump running, it or the relay is bad. It could also be the oil pressure sender, but the pump should still prime.

Have/can you check the fuel pressure?

I have not check the fuel pressure. And it has a brand new oil pressure sending unit that I put in when I did the overhaul. I have only put about 1,000 miles on it since I bought it a year ago.

Also when I bought it had a newer fuel pump in it. (They cut a hole in the bed to changed it)
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 09-25-2011, 09:42 PM   #6
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by scotts62 View Post
Squirt a shot of starting fluid down its throat that will tell you if its ignition or fuel related.
Thanks I'll give that a try. Are they any sensor that I have to worry about.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 09-25-2011, 11:40 PM   #7
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Cutting then bed seems like more work than actually taking the bed off when pulling the tank is much easier.

No, just spray enough to get it to fire once.
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Old 09-26-2011, 07:22 PM   #8
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by scotts62 View Post
Cutting then bed seems like more work than actually taking the bed off when pulling the tank is much easier.

No, just spray enough to get it to fire once.
I agree but I patched it back together and but a rubber floor mat in and it also sits under the tool box.

I have not had time to work on the truck yet, maybe tomorrow.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 09-30-2011, 03:17 PM   #9
justcuz
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Re: 1997 gmc k2500 cranks but won't start, need some help!

See if the ignition switch on the steering column is loose and slid down out of adjustment. It is on the column under the dash. While you are under there check the neutral start switch. After that check the fuel pump fuse and relay. My guess is it is ignition switch related, or the neutral start switch.
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Old 10-01-2011, 11:38 PM   #10
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Check to see if I had spark today and there was none. So I have NO SPARK AND NO FUEL. I am leaning towards the ignition switch.

Also has anyone every heard of a fusible link on these vehicles?

Thanks again for all the responses.

I'll let you guys know when I make more progress. I work a lot so it is hard to get to it.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 10-02-2011, 06:58 AM   #11
dragginmetal
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by jritch85 View Post
also has anyone every heard of a fusible link on these vehicles?
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Old 10-11-2011, 11:42 AM   #12
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

GOT IT RUNNING AGAIN!

I decide to risk spending $144 on a new AC Delco ignition switch. It fixed the problem. Hopefully someone with similar problems will stumble upon this thread someday and it will help them too.

THANK YOU to everyone who posted something on this thread to help me.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 10-11-2011, 11:44 AM   #13
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by dragginmetal View Post
I believe this is a diagram for a 88-95 obd1 Chevy trucks.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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Old 10-11-2011, 01:29 PM   #14
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by jritch85 View Post
I believe this is a diagram for a 88-95 obd1 Chevy trucks.
Sorry abought that. It showed a fusible link, is why i posted it.
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Old 10-12-2011, 09:42 PM   #15
jritch85
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Re: 1997 gmc k2500 cranks but won't start, need some help!

Quote:
Originally Posted by dragginmetal View Post
Sorry abought that. It showed a fusible link, is why i posted it.
No Problem, Thank you for your help.
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1997 GMC Sierra SLE K2500, 350 Vortec, 4L80E
1978 Chevy Silverado K10, K20, K30... 400 SB, Turbo 350 (my hybrid)
1973 Chevy Custom Deluxe K20, 350, SM465 (parts)
1988 Chevy Scottsdale C10, 4.3, Turbo 400 (parts)
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