Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi, my name is ***** ***** am happy to assist you today! You will need to either rent a fuel pressure gauge at a local auto part store (If available) or buy one such as this. http://shop.advanceautoparts.com/p/actron-fuel-pressure-tester-kit-cp7818/9030328-p?iv_=__iv_p_1_a_214327102_g_12425515822_w_aud-62603320895:pla-191564893942_h_9021434_ii__d_c_v__n_g_x_pla_y_6201684_f_online_o_9030328-P_z_US_i_en_j_191564893942_s__vi__&utm_source=ACQ&utm_medium=cpc&utm_campaign=PLA&utm_content=shoppingcampaigns&gclid=Cj0KEQiA9ZXBBRC29cPdu7yuvrQBEiQAhyQZ9GxbxC_hMckN7wL1FTgTzJ1i2iX4KUBNif8Vp8m5HGQaAsjw8P8HAQ Once you have obtained the fuel pressure gauge, go the fitting on the fuel rail and screw the tester on. Start the engine and observe the fuel pressure. It should be in the 50-60psi range at idle. I've attached a picture of the location of the fuel pressure test port on the engine. You will have to just pop off (requires a bit of force) the black rectangular cover on top of the engine to access the port. Please let me know if you have any more questions before you decide to rate me, thanks!