Quote:
Originally Posted by 97 SL320
Change the box fuel filter element at engine.
Do all of the glow plugs work, prechamber diesels need good glow plugs? Ohm each one out or use a clamp on amp meter to test.
An electric fuel pump near the tank does wonders for injection pumps / systems that bleed down. The ones that look like an inline fuel filter work fine. Wire it through an pressure switch that looks at oil pressure so the pump does not run if engine stalls.
Use a manual button so you can run the pump to prime the system before cranking.
I'm pretty sure these pumps ( Stanadyne / Roosa-Master ) have a problem with a plastic ring breaking affecting injection timing. There also might be a cold timing advance system to assist in cold starts.
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I'll check the glow plugs in the next few days. The glow plug dash light works as well as it ever did, not sure if that means anything, I seem to recall reading here that no glow plug dash light was sign of a problem.
Your suggestion about an oil pressure switch sounds right on. I know on my BMW E30s there is a fuel pump relay designed for the same purpose, to shut off the fuel pump when the crankshaft is not turning. Oil pressure would be easier to access in this vehicle than some likely non-existant crankshaft position sensor.
That said, I found a couple of oil pressure switches on the web, they have a pipethread base, not sure where I'm going to find a port to attach such a thing.