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Hello, working on a 2008 C300 3.0 Flex. Car had been sitting for a few weeks. Sunroof drains clogged up and damaged the CAN bus blocks on the floor. Those have all been replaced and they got the car running for a short time. Car ran great. Drove around for about 5 minutes no issues. Parked it and it would not idle anymore and started sputtering and stalled out. It hasn't ran since. Haven't scanned codes yet but will when a new scanner arrives. Old one quit. Car cranks over and sputters. Throttle input does nothing. Can hear the fuel pump and can smell fuel. Car has around 130,000 miles. Have a crankshaft sensor on order just cause. Anybody have any ideas. Obviously the code scanner will be needed. Figured I'd ask. Thanks in advance for all that reply.
Sounds like it's choking on bad gas. You sure about what's in the tank?
Not exactly sure on the fuel age or quality. Only has a quarter tank. What's weird to me is it drove perfectly fine for 5 minutes then as soon as it was parked idling like trash and stalled. Not saying the gas isn't trash and what was in the lines was good
There's also phase separation from fuels with ethanol and age. "Age" dependent on humidity, ethanol % and temperature. If it is bad gas, not sure how to drain the lines, though.
There's also phase separation from fuels with ethanol and age. "Age" dependent on humidity, ethanol % and temperature. If it is bad gas, not sure how to drain the lines, though.
That is correct. Hmm. Might try some stabilizer and some fresh fuel and see what happens. The sputtering and stalling was awful and even sounded like a backfire through the intake making me think crank sensor.
Well put about five fresh gallons of fuel in it and it really wanted to run but never would. Just sputtering. Found barely any pressure at the rail. Looks like fuel pump isn't making enough pressure but is pumping. Ordered a new assembly. Also pulled a spark plug and it was very dark and looked worn out. Replaced them all with Bosch DP per OEM, same issue. Hopefully the new pump solves the pressure issue. I can hear the fuel pump but only barely. Its just so odd it ran fine for a short time. Perhaps it ran off of what was in the lines and then once the pressure was gone that was it. We shall see. I haven't checked that flex sensor yet after finding low pressure.
Just became aware that they have a main fuel pump as well as a transfer pump/filter on the left side of the vehicle. I ordered the primary pump due to low pressure. But now I was wondering if the other needs to be replaced as well. Is it a common thing to replace the transfer/filter pump and if so, I'm having a rough time finding the correct part online. I'm going to assume that the car will run if the filter/transfer pump (left) has failed so long as the primary pump is working and vehicle has sufficient fuel?
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
How many miles on the car? Please confirm your engine model. You can find it if you enter your VIN here.
I believe that the gas tank is a saddle type that fits over the driveshaft. It has a main pump, as you said, from the tank to the engine. But there is another pump that goes from one side of the tank to the other, again, as you said. Numbers 7 & 8 are your two pumps. Find your part numbers at the link below.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by olebenz
Just became aware that they have a main fuel pump as well as a transfer pump/filter on the left side of the vehicle. I ordered the primary pump due to low pressure. But now I was wondering if the other needs to be replaced as well. Is it a common thing to replace the transfer/filter pump and if so, I'm having a rough time finding the correct part online. I'm going to assume that the car will run if the filter/transfer pump (left) has failed so long as the primary pump is working and vehicle has sufficient fuel?
I concur that if you have fuel in the right side where the main pump is, you should have sufficient fuel delivery even if the suction/transfer pump failed. Have you scanned your car with an appropriate Mercedes-specific scanner?
Well for reasons unknown. I now have full fuel pressure. However now the car immediately pops fuse 25 under the hood on startup. Anybody know where to start looking for this apparent short? The diagram just says engine electronics.
06-28-2024, 09:23 PM
