tag:blogger.com,1999:blog-6692638944540634783.post4695158244198987916..comments2024-03-22T15:19:26.675+08:00Comments on brunei-er34.blogspot.com: Project : W210 [ Engine & Electrical - Fuel Pump & Fuel Filter ] Unknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6692638944540634783.post-77251173282594730832021-08-01T23:00:18.541+08:002021-08-01T23:00:18.541+08:00The fuel pump must have a 12.6volt supply and a 0 ...The fuel pump must have a 12.6volt supply and a 0 (zero) volt Ground , provided<br />by the computer via a relay.But sometime the computer is prevented from doing this ny the. Immobiliser/ & DAS/das(drive authorization system) for reasons of not recognising the ignition key via the Key_Ring Coil & Transponder. In this case if one checks the power , will read the 12.6volt but there will be 3.9volt showing as Ground voltage at the Fuel relay and Fuel pump but not (not zero)0v0lts Thus 12.6 minus 3.9 equals =remaining volts applyied =8.7 volts to both the relay and the fuel pump ; therefore the pump does mot function<br /><br />At the same time the 3.9volts Ground is supplied to the Fuel injectors , so they do not functionAndreas Alevrashttps://www.blogger.com/profile/03757962391300120417noreply@blogger.com