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vehicle won't turn over


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03-21-05, 07:55 PM   #1  
mystic434
vehicle won't turn over

I have a 1996 GMC Sierra 6 cylinder 4.3 liter engine. Wires on the sending unit got fired and fused together. I replaced the unit and wires. I also replaced the fuel pump. There is no fuel going to the pressure release value. THe truck won't turnover. Do you have any suggestions on what could be the problem?

Mystic434

 
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03-21-05, 08:20 PM   #2  
It's late, but before I sign off tonight I should ask for clarification on problem.

You replaced the fuel pump sending unit and wires.
You replaced the fuel pump.
You have no fuel pressure.

I was not aware of a fuel pressure relief valve for that year? Is it what you say it is?

The engine will turnover, but will not start?
Or
The engine will not turnover at all?

 
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03-21-05, 08:24 PM   #3  
mystic434
vehicle won't start

It won't turn over at all. Sorry no fuel pressure release value. Yes to all three. I haved replaced just about everything that I can think of, and it still will not start.

 
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03-22-05, 05:32 AM   #4  
I think you are trying to describe a 'no start' condition, but you also imply it will not 'crank' with the starter motor.

It cranks with the starter motor but engine will not start and idle?

Or, it does not crank ?

 
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03-22-05, 05:53 AM   #5  
mystic434
it does not crank at all. the battery is dead and even after i replaced it, the truck still won't start.

 
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03-22-05, 06:15 AM   #6  
Describe what happens when you turn the key.
Do you hearing any noise? A clicking sound?

Did you install the battery with the + - post reversed?

Does the radio and head lights work?

When did 'no crank' condition begin,, immediately after you replaced the battery or immediately after you replaced the fuel pump?

 
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03-22-05, 08:19 AM   #7  
mystic434
immediately after i replaced the fuel pump. Yes the radio and headlights work.
I just hear a clicking sound

 
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03-22-05, 10:53 AM   #8  
fuses

check all fuses and fusible links, they may have done their job and really saved you a whole bunch of problems.

 
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03-22-05, 11:59 AM   #9  
Test your battery voltage with any voltage test. It should read about 12 volts. It is probably a bad battery. You could also try charging the battery with a charger if the battery is as new as you say it is.

 
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03-22-05, 01:43 PM   #10  
mystic434
will check the battery. I also checked the fuses under the hood and dash. They all looked good. Is there anymore fuses that I need to check?

 
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03-22-05, 02:00 PM   #11  
no. now check the battery.

 
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03-22-05, 03:04 PM   #12  
mystic434
the battery is good. I took it out and took it to an auto parts store and they checked the voltage for me.

 
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03-22-05, 03:38 PM   #13  
If the battery is good as you say it is, then you have a problem in the battery/starter cable, or the starter is bad.

There are 2 things that can be tested, and more than one way to test them.

1. Perform a voltage drop test on the starter cable while someone is cranking the engine. Press one probe of the your VOM (voltage meter) to the positive battery post itself, (not the cable terminal). Press the other probe to the starter bolt where the thick cable attaches. Again, press to the threaded bolt, not the cable terminal. You will need a jumper wire, say 3 ft to be able to reach the starter. Have someone crank the engine for 2 or 3 seconds and record the voltage reading at the time of cranking.

2. Remove the starter and take it to an auto parts store that performs free starter testing.

 
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