Buddy, you're guessing again.I ordered e new pump.
Your statement makes it sound like the fuel pump is pumping fuel, which is what fuel pumps are supposed to do.Took the old one apart to see what it looked like, looked fine so I put it back together.
I filed it with fuel and put it back on with the gravity hose filled and when I cranked it fuel over filled the hose instead of sucking it in.
To me i seems hat the check valve in the pump is letting the fuel back up the gravity hose, it should lower the fuel in the hose.Buddy, you're guessing again.
Your vehicle is built out of many thousands of parts- the odds of you guessing correctly are pretty slim.
Did you order an aftermarket fuel pump, or a genuine Mercedes-Benz fuel pump? I'd hate to see you install any more problems into your vehicle.
Your statement makes it sound like the fuel pump is pumping fuel, which is what fuel pumps are supposed to do.
LP pump draws in through the lower fitting, pushes out through the upper fitting. From 2003 service manual:Are you certain the inlet and outlet hoses aren't reversed? If memory serves they use the same fitting.
-daveOPERATION - LOW PRESSURE PUMP
The low pressure pump draws fuel from tank through fuel filter and supplies the high pressure pump. Fuel pressure at starter speed is 0.4 to 1.5 bar (6 to 22 psi.). A fuel pressure of 2.0 to 2.5 bar (29 to 36 psi.) is reached at idle speed. Fuel pressure is lim- ited to 3.5 bar ± .5 bar (51 psi. ± 7 psi) by the valve in the fuel delivery pump. This valve opens by over coming a spring force and allows excessive fuel to flow to the intake side of the low pressure pump. This diverted fuel flows into the return flow pipe through the fuel cooler back to the tank. As a result of this circulation, the fuel always remains relatively
Thanks, I will run it through a coffee filter first.It needs to be VERY clean fuel. (filtered to 5 micron minimum) Otherwise I suggest using a hand vaccum pump to pull filtered fuel up through the filter. The injectors and pump are very sensitive to contamination, even contamination you can't see.
MWD,GT is just trying to get a rise out folks, and possibly make himself feel better/superior, while simultaneously feeding a deep seated need for attention. Add him to your ignore list and don't provide food for the troll.
As I previously stated:Well I am not having good luck, I replaced the low pressure pump, filled it by sucking fuel through the filter, and I still have no fuel at the injectors.
I just do not know what to check next.
I would strongly recommend that you stop guessing by randomly replacing parts for no reason. In addition to spending your money for no reason on parts that your vehicle may not need, you may actually be installing additional problems AND you're not solving your original Complaint. I have seen this happen many, many times.
Guessing is by far the most time-consuming and expensive method of vehicle repair. I would recommend diagnosis instead. Diagnosis is by far the least expensive and quickest method of vehicle repair.