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post #11 of 30 (permalink) Old 06-29-2019, 06:27 PM
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I will purchase a fuel pressure gauge and follow your suggestion. Since I am not a mechanic, I will have to look into the procedure so it may be a couple of days before I can reply with observation. If the pressure drops rapidly, is there a way to determine if the problem is the bad check valve, the fuel pump, or leaking injector(s). Thanks for your help.
You will have trouble finding gauge that is needed for quick assessment of possible problem. Gauge needs to have gate valve (D) before and after.



Here is test method. STAR TekInfo
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post #12 of 30 (permalink) Old 06-29-2019, 07:10 PM
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Sorry for any confusion. In the morning before I start and warm up the car, the reading on the dash gauge is the ambient temperature (below the 40 degrees C marking). As the engine is fully warmed up, the dash gauge reads 85 to 90 degrees C. After the warm up is when there is a starting issue.
Then the coolant sensor is fine. It it showed low temps when the engine is hot, you would have warm start up issues.

Regarding the fuel issues, if you had a fuel pump check valve issue, then you would have a start issues after the car rests for a while (like when you start the car in the morning). You do not have that issue, do you ?

How long is the time between the hot engine stop and start that causes starting issues ? 2 minutes ? 10 minutes half hour ? more ?
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post #13 of 30 (permalink) Old 06-29-2019, 08:13 PM Thread Starter
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10 - 15 minutes. If I drive the car, turn it off, and try to restart within a few seconds, it starts fine. If I come back and try to start it after 10-15 minutes, it will not start on the first try but start immediately on the second try.
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post #14 of 30 (permalink) Old 06-29-2019, 08:17 PM Thread Starter
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Thanks for the guidance. I will try to test this Monday/Tuesday.
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post #15 of 30 (permalink) Old 06-29-2019, 08:18 PM Thread Starter
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Thanks, I'll check at autozone first.
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post #16 of 30 (permalink) Old 06-29-2019, 08:56 PM Thread Starter
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Hi Witek, Why are the gate valves necessary?
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post #17 of 30 (permalink) Old 06-30-2019, 07:05 AM
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Hi Witek, Why are the gate valves necessary?
They are not absolutely necessary but make assessment quicker. You connect gauge set with valves between feed line and fuel rail. Shut engine off and at the same time close valve closer to the rail. Now we are looking at feed side. Pressure dropping problem is with fuel pump check valve or pressure regulator.

Repeating same test this time closing valve closer to feed line isolates potential problem at feed side and lets us look at injector(s) only.

Whatever method is used end result residual pressure after 30 minutes >2.5 bar.
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post #18 of 30 (permalink) Old 06-30-2019, 07:46 AM Thread Starter
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Thanks for your help.
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post #19 of 30 (permalink) Old 07-07-2019, 11:51 AM Thread Starter
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I checked the fuel pressure this morning. The pressure was 0 psi before key changed from position 0. The pressure changed to 10-12 psi after turning key to position 2. When turned off and back on to position 2 a couple of times the pressure remained at 10-12 psi. When motor starts, pressure changes to 55-60 psi at idle and multiple higher rpms. When motor is turned off, the pressure drops rapidly within 5-10 seconds. This is on a 1999 MB E320 wagon (not 4 Matic). Is there a separate check valve or pressure regulator? I looked for parts and none show up. Can't tell with schematic. Is the pressure and check valve part of pump? Also, I determined the pressures at the access port at the end of the fuel rail so could be leaking injectors; but it was suggested here that this is probably not the case if the pressure drops precipitously. Any comments/suggestions appreciated.
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post #20 of 30 (permalink) Old 07-07-2019, 12:08 PM
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The check valve is part of the fuel pump, and I believe the regulation is done by the pump itself, or maybe part of the fuel filter.

You have a bad fuel pump. But this does not really explain why the car starts perfectly first thing in the morning and not when the engine is hot. Typically a bad check valve causes long cranks especially if the adequate fuel pressure at the fuel rail is not yet built up.

So you need to change the fuel pump, and then address the other issues remaining.
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