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Old 12-22-2018, 05:22 PM
97 SL320 97 SL320 is offline
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Join Date: Jan 2012
Posts: 7,534
The two pump system went away in the early 90's when CIS / K jet was replaced with electronic FI.

The fuel pump is under a fiberglass cover so you need to remove it for access.

Under the hood, locate the fuel pressure regulator at the end of the fuel rail. Listen for this to buzz / squeak for 3 seconds when key is turned on. Since the pump only runs for 3 seconds, have a helper. Also, the throttle body will make buzzing sounds so don't confuse this with the regulator.

I'd give the engine a puff of starting fluid / carb cleaner and see if it kicks. ( Do this after the air flow sensor )

Next step is to look at scan tool data while cranking and see if there is any RPM. If you lose the crankshaft sensor signal, you will lose fuel injector pulse and ignition.
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