Using A Quality Fuel Filter
09-15-2016, 10:43 PM
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'03 ML500 & '11 R350
Using A Quality Fuel Filter
Just got done replacing a fuel filter for the second time in 2 months.
I originally used a Pierburg pump, Purolator filter and O.E.M. relay. Well that setup lasted 2 months... after using a fuel pressure gauge (anyone trying to diagnose a fuel issue without one is wasting time) to check fuel pressure at the rail while priming and on startup. This showed there to be 1-3psi of pressure (min spec. is 51psi - max 64psi) in the rail. After much more diag. and wasting time checking old parts, I changed out the Purolator with an O.E.M. MB one. I primed the fuel system and on the second start the fuel rail pressure shot straight to 55psi and stayed there. This is the only part I replaced in the system to regain fuel pressure.
The kicker is that the O.E.M. filter is only $5 more than the Purolator at my local auto parts store.
USE QUALITY FUEL FILTERS
I originally used a Pierburg pump, Purolator filter and O.E.M. relay. Well that setup lasted 2 months... after using a fuel pressure gauge (anyone trying to diagnose a fuel issue without one is wasting time) to check fuel pressure at the rail while priming and on startup. This showed there to be 1-3psi of pressure (min spec. is 51psi - max 64psi) in the rail. After much more diag. and wasting time checking old parts, I changed out the Purolator with an O.E.M. MB one. I primed the fuel system and on the second start the fuel rail pressure shot straight to 55psi and stayed there. This is the only part I replaced in the system to regain fuel pressure.
The kicker is that the O.E.M. filter is only $5 more than the Purolator at my local auto parts store.
USE QUALITY FUEL FILTERS
