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Old 02-13-2006, 12:19 AM
Join Date: Oct 2005
Location: Exeter, CA
Posts: 16
Red face diesel fuel gizmo leaking, what is it?

My son has my old 1987 300D Turbo (240,000 miles so far). I couldn't find an exploded diagram on this site so here goes my best description of what I think we need. On the left side of the engine (from drivers seat), the fuel travels through this little clear in-line fuel filter thru a short black small hose that goes into this metal cylinderical gizmo bolted to the side of the block. It has about 4 other small black flexible hoses connected to it with small hose clamps. The white plastic part that the hose from the in-line fuel filter connects to is loose and leaking diesel. Looks like I need to replace this approx 2" long metal fuel dist. thing. Anybody know what it is, what its called, part number and or what it costs? Any special things I need to know to change it out? Thanks much in advance. PS are there any exploded parts daigrams on this site?

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Old 02-13-2006, 10:30 AM
Registered User
Join Date: Jul 2004
Location: St. Louis MO
Posts: 160
Get an O ring for it.

That's a fuel thermostat and it is where My 92 300D was leaking. You can replace the whole thing for a bunch of money or just change the O ring under that white plastic part for under a dollar. Go to the dealer, buy an O ring, and get him to print out the section of the parts diagram that has the thermostat so that you will see how it all goes together. Disconnect all of the fuel line hoses that go in and out of the thermostat (this is a good time to replace all of those hoses too) and remove the assembly. It is bolted on to the motor mount with a couple of 6 mm bolts. Pull out the white part by removing the snap ring and replace the O ring. Then put it all back together.
The other places my car leaked fuel were the delivery valve o rings and the O ring under the stop lever. Do a search and you will find out how to do that. The only tricky part of the delivery valve O ring job is that you have to have the spline socket and you have to do a 3 stage torque procedure on the delivery valve covers to seal the O rings.
Do the whole job while you are in there because it is messy with all that fuel leaking out once you disconnect the hoses.
Tom Hughes
St. Louis
84 300SD
92 300D
86 300SDL
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Old 02-13-2006, 09:07 PM
Join Date: Oct 2005
Location: Exeter, CA
Posts: 16
Tom, many thanks. You nailed it.

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