Question about 1999 GMC Suburban
Our security light is stuck on and now the charging light and check gauge light is on as well... it will turn over but will not hold fuel pressure to start
Not sure I am following you.
The security system is supposed to keep the engine from cranking if the correct key is not used.
The check gauge and charging light would be on until the engine starts.
You have checked fuel pressure with a gauge and you know the line is not pressurized when you crank the engine ?
Posted on Jan 13, 2013
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Posted on Jan 02, 2017
I believe you have a fuel regulator weak or dirty injectors.
Try turning the key to the "on" position ( do not try and start) wait until fuel pump stops running (3-5 seconds or so ), turn the key off and immediatly repeat for 3 cycles. On the 4th key rotation, start the vehicle. Does it seem to start up faster?
If so, the regulator is weak, however, the fuel pump does have a check valve in it to prevent fuel from leaking back into the pump and maintain line pressure.
Try the diagnostic proceedure above first and we can go from there.
Good luck, let me know.
Posted on Jul 15, 2009
The fuel pressure valve is stuck open and drains the fuel (via gravity) back to the tank.
Check the fuel pressure regulator / replace.
You might want to put a bottle of "complete fuel system" cleaner ($8 AutoZone) in the gas (not diesel) tank, next fill-up. It may do the trick in a couple of days.
Posted on Oct 12, 2009
Testimonial: "Thanks for your reply! I'll add the fuel system cleaner tonight and check the pressure regulator this weekend. Thanks again."
turn the key on and wait for the security light to go off about 10 to 15 minutes then turn key off and back on an try starting it. this usualy clears the pass key II system
Posted on Oct 15, 2009
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