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Old 06-19-2008, 12:30 PM
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JimFreeh JimFreeh is offline
Benz addict
 
Join Date: Mar 2007
Location: Hampton Roads, Virginia
Posts: 3,366
Quote:
Originally Posted by RES View Post
I am having intermittent starting problems with my C220. Occasionally it will crank but doesn't start. I am leaning towards a fuel delivery problem.

My questions:
o Once I turn the ignition on prior to cranking should the fuel pump be running? Will it go up to pressure and then turn off?
o What is the purpose of the Fuel Cutoff Relay?

My feeling is that I should be able to tell if the pump is operating by feeling it once the ignition is on.

When you turn the ignition switch on, the pump should run for only a few seconds.

It should run whilst cranking.

Might be best to check this out with two people, one at the switch, the other observing the pump.

Jim
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