If your talking about a bump switch for the fuel system, I've only seen that on some Ford systems, not GM.
Can you check for trouble codes? On some systems, the computer monitors the voltage on the fuel pump circuit, if there is no voltage when there should be, a code may set. Check fuel pressure?
You could also check for spark at the plugs. You could use a cheap spark tester or use a known good spark plug, just pull a plug wire loose at the plug, insert the good plug in the boot, ground metal part of plug against metal part of engine, have a helper crank it, while you watch for spark at the tip of plug.
Tuesday, November 18th, 2008 AT 3:53 PM