p0087 - wont start
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Newbie
Joined: May 2019
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2005 E320 cdi
p0087 - wont start
I have looked everywhere for an answer. I have 2005 E320 cdi sedan with a p0087 and wont start. I have replaced fuel pump and fuel sending unit in gas tank. I have replaced high pressure fuel pump and fuel filter and fuel pressure sensor.
When put in "on" position I can hear pump start up and push gas towards engine. I can loosen bleed valve on fuel filter and gas will spew out the top of fuel filter. But it will not crank over. What could i be missing????
When put in "on" position I can hear pump start up and push gas towards engine. I can loosen bleed valve on fuel filter and gas will spew out the top of fuel filter. But it will not crank over. What could i be missing????
Thread Starter
Newbie
Joined: May 2019
Posts: 4
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2005 E320 cdi
UPDATE: I disconnected fuel injector from fuel rail. I expected the fuel rail would squirt fuel but that did not happen. I put a multimeter on connector to high pressure injection pump and got only 8 volts while cranking I'm thinking the high pressure pump is not engaging. Should it have all 12 volts while cranking?
Thread Starter
Newbie
Joined: May 2019
Posts: 4
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2005 E320 cdi
High pressure pump appears to be mounted correctly. Seated well on housing, no leaks both connectors connected. It is brand new Bosch. At this point, i think it is electrical. I undid the connection to the first fuel injector. When cranking, gas should have squirted out the fuel rail opening and didn't when I cranked it, so no pressure which would indicate the high pressure pump not engaging??. The 2 pin connector to the high pressure pump is only reading 8 volts when cranking. Wires look fine. Not sure where to go from here.
Junior Member
Joined: Aug 2007
Posts: 60
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94 e320s
check the fuel pump relay at the fuse box located in left trunk side panel, if you bridge the relay you should get battery voltage, if you don't , removed the fuse/ rear sam sam box out and look at the plugs, its a 5 or 6 pin plug , they may be burned, don't have the id locations but I know its near the big red battery connector ,quit calling it a high pressure pump your going to confuse people its a fuel pump operates to approx. 56 psi, high pressure pump system operates higher thousands of psi
Last edited by lululu; May 19, 2019 at 06:41 PM.
