I haven't been able to post on the M-100 forum yet. I guess the administrator needs to accept me still. . .
I'll continue to post here until I can post on the M-100 forum. Maybe I can pick your brains a little longer
A few more thoughts:
I haven't actually tried to crank over the engine yet, but I'm wondering if the aftermarket fuel pump is insufficient. My service manual says the the pump needs to supply a minimum volumetric flowrate of 1.0 Liters in 15 seconds and a minimum pressure of 1.3 atm at the overflow of injector pump. I converted these values to English units, and if my math is correct, this means the pump must deliver roughly 63 gallons per hour at roughly 19.1 psi. Carter doesn't make a rotary-vane type fuel pump that delivers both the required volumetric flow rate at the required pressure. The most likely one installed (I haven't had time to actually look at it yet, but I know it's a rotary-vane type) might deliver 100 gph at 18 psi (these values were obtained from the latest Carter specs). Could this slightly lower output pressure cause the engine not the start, assuming everything else works? Based on prior experience (at least on American engines and fuel systems), the required pressure and flowrate really matter at high load and wide-open throttle, not starting nor idle conditions. Is this also true for the M189 enigne? Or does the fuel flow rate and fuel pressure count at all loads and all throttle positions? If this is true, I really don't want to spend $500+ on an OEM Bosch pump (unless I absolutely HAVE to in order to obtain the ideal flow rate and pressure), so I'm wondering if an in-line type aftermarket fuel pump (roughly half the cost) with somewhat higher flow rates and pressures (say, around 75-100 gph at 30-40 psi) will work. What do you think?
Once I clean out the fuel tank, fuel pump, injector pump, and replace all the fuel lines and fuel filter element, I'll measure the fuel pressure at the injector pump to confirm the feed pump's output. Then, I can further diagnose my fuel problem.
One more thing: I heard these engines can tolerate unleaded, premium fuel. Is this true? Dad always used a lead-substitute, but I heard a rumor somewhere that all Mercedes engines are able to safely run on unleaded fuel without damaging the valve train. Any thoughts or information?
Any othe advice? Tips? Online, free resources? Like I said, I REALLY love this car. It is beautiful: the paint is spectacular, the interior is luxurious, and the chrome is stunning! Except it doesn't start. . .