Self Bleeding Diesel Fuel System - Defender Source
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Old March 29th, 2014, 09:31 AM
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Robert Davis
Join Date: Oct 2004
Location: USA
Posts: 6,815
Self Bleeding Diesel Fuel System

Have had lots more questions about diesel fuel line routing.
Here are a few pictures of an Isuzu 4JB1-T setup, but the same for any diesel install.

Routing = tank, sedimenter, 12V fuel pump, engine lift pump, Fuel Filter, IP, return line back to tank.
Pump wiring from 12V relay =
86 - ignition circuit - white (+) when key is on
85 - ground (-)
30 - Positive (+) from battery (usually taken off main starter lead)
87 - (+) when key is on

No need to ever worry about bleeding the system.
If you run out of fuel or you change the filter, simply switch on the key, wait a few minutes, start the engine, and drive away.

If you get a bad batch of fuel, note the drain screw on the sedimenter.
Drain as many times as necessary until you purge all the smeckley and then drive away.
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Old March 30th, 2014, 12:48 PM
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LRC Customs #003 D110 Soft Top
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Any reason not to put the 12v fuel pump closer to the lift pump to shorten the electrical runs?
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Old March 30th, 2014, 02:47 PM
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Don Bunnell
'86 110 3dr ST
Join Date: Sep 2007
Location: Rumson, NJ
Posts: 4,272
Robert - any particular fuel line you like to use?

I am thinking of running the fuel line and return down the left hand side of the new build - IP, pump, filter of the OM617 is on that side. And I think I can keep the sedimenter on the outside of the left hand frame rail for easy viewing.
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