Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

Injection Relay Issues

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Old 09-17-2015, 10:21 AM
dwmeehan's Avatar
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Default Injection Relay Issues

Howdy Folks,

I have been experiencing some issues with my fuel pump relay located beyond the air filter and turbo. Upon replacing / relocating the PMD prior issues were resolved. About a week after that she would not start right up in the morning, it took about 10 minutes of cranking -- no partially combusted fuel just the alternator cranking. Finally I got her to turn over but the motor sounded much higher pitched, louder, and 'mechanically rough' and of course a check engine light (I need to check the codes) I did some digging on the issue and found the fuel pump relay may be the culprit. Sure enough I swapped this bad boy out and no more issues.

However... This morning I felt a very slight jerk and the check engine light came on so I pulled over, turner her off and went to crank and same issue with delayed cranking... I unplugged the relay waited a few minutes turned her over and still same issue. After getting home I turned her off and back on and no issues!

I believe I must have some sort of electrical issue within the injection system -- does anybody have any input on why the fuel pump relay will go bad, continuously?

Thanks guys
 
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Old 09-18-2015, 07:49 AM
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Whacky.

Are the glow plugs coming on? Dash lights acting weird? Any random shutoffs?
 
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Old 09-20-2015, 03:08 PM
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The glow plugs seem to be fine. I had intermittent random shut offs before I replaced / relocated the PMD but no issues with that since.

I have not any issues since my last post (knock on wood).. I am just looking to track down what is down line from the relay

Thanks for the response
 
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