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Hummer H2For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.
and here is a snippet from the GM manual showing the hook-up albeit it's a poor diagram:-
The pipes don't look like yours, but the connector does and I would imagine pressing the pin would release fuel under certain conditions, quote:-
"Caution: Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gage. Place the towel in an approved container when the connection of the fuel pressure gage is complete.
Notice: Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:
• The fuel pipe connections
• The hose connections
• The areas surrounding the connections
Install the fuel pressure gage to the fuel pressure service connection, located on the fuel rail.
Turn ON the ignition.
Caution: Do not drain the fuel into an open container. Never store the fuel in an open container due to the possibility of a fire or an explosion.
Place the bleed hose of the fuel pressure gage into an approved gasoline container.
Open the bleed valve on the fuel pressure gage in order to bleed the air from the fuel pressure gage.
Command the fuel pump ON with a scan tool.
Close the bleed valve on the fuel pressure gage.
Inspect for fuel leaks"
Just another thought, should fuel flow from here with key on and pressing pin ? ( it doesn't) not had chance to do much else yet.
It will only have fuel pressure for an initial 2 second prime or fuel pressure while cranking. Key On Engine off will not have pressure after the initial 2 seconds.
Got most of alarm removed, no change, engine will start, run rough / lumpy ,backfire, run fast on its own eventually cutting out. No codes showing up. Someone said could be crankshaft sensor so got one on order.
Chevykev, glad to hear you got most of the alarm out. Soon you can concentrate on the engine issues.
What Bronxteck suggested is a good idea, Electrical issues/bad MAF can cause all kinds of crazy issues. The Crank sensor usually cause no start issues but perhaps yours is on the verge of just crapping out completely. While you down there check the connector to see if its clean and making good contact. Do you have access to a high end OBD2 tool that can do a trigger crank sensor relearn? If you have a buddy with a tech2 its a few minute job. GM will charge you about $85 if you can't do it yourself.
Chevykev, glad to hear you got most of the alarm out. Soon you can concentrate on the engine issues.
What Bronxteck suggested is a good idea, Electrical issues/bad MAF can cause all kinds of crazy issues. The Crank sensor usually cause no start issues but perhaps yours is on the verge of just crapping out completely. While you down there check the connector to see if its clean and making good contact. Do you have access to a high end OBD2 tool that can do a trigger crank sensor relearn? If you have a buddy with a tech2 its a few minute job. GM will charge you about $85 if you can't do it yourself.
Looks like it was MAF sensor took it out, cleaned it all seems good ! Removed all the alarm , seems to have cured battery drain. Thank you everyone for your help
ChevyKev, Fantastic, You've gotta love it when a plan comes together especially when you get in there and do it yourself. I was a little worried when I saw that rats nest of alarm wiring. No easy feat to pull those out and have everything work!
10-19-2021 | 03:57 PM
