Intermitting Electrical Problem
 

I have a 2002 Chevrolet S10 Extreme V6, I think 4.3 L, spark and fuel pump dropping out while driving. Which can be dangerous at times. Love to drive vehicle around. Am suspecting ground issue. Can someone tell me where all of the grounds are located? Truck runs really good when it runs but it cuts out, no codes are detected. Already disabled security device. Replaced fuel pump relay and fuel pump,
Thanks in advance for input to this issue.

How long have you owned it?

How many miles on it?

What region does it live in?

Has it had any major trauma (accidents, floods, etc.)?

Have you checked the battery terminals for tightness and corrosion?

Was the fuel pump replaced for this issue or another issue?

Possible ignition switch.

I have owned it for 13 years
170,000 miles
I'm in VA
Battery cable and terminals tight and clean
Replace fuel pump and relay with all GM OEM

Ignition switch has been replace with oem

Wondering if ICM is getting hot and failing.

What makes you think fuel pump is dropping out?

Are you sure you are losing both spark and fuel pump? This is critical to know for sure.

Yes 100% sure fuel pressure goes from 60psi to 0psi and 12 volt at coil goes from 12.7 to 0

The fuel pressure isn't a constant. If the engine all of a sudden stops running due to ignition issues, the pump will run few more seconds then stop. The pump will turn back on when cranking starts and the ECU sees ignition signal.

When truck stops running I have no voltage at coil +wire and fuel pump is not running when I use a test light to test for power try it a couple times when light lights I have fuel pressure and voltage to coil now it will run perfect for a day or so that's why I am thinking it is a ground problem thanks for all the input