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by **1973_280E** » Mon Dec 26, 2005 1:04 am

I'm at the tail end of a full engine reconditioning process for my w114 280E M110. Going through the engine testing phase we have found the fuel to be a bit lean. The 280E has 2 fuel regulators from what I can gather (one for in flow and one for out flow), making it difficult to tune the fuel pressure correctly.

I find that all the manuals available to me go out of their way to avoid the 280E fuel and injection system... so annoying!

Has anyone else had a similar experience in adjusting fuel pressure on this engine model? Anyone have some data on seting the pressure between the two regulators?

by **OzBenzHead** » Wed Dec 28, 2005 12:11 am

G'day, 280E

Might be worth trawling through this manual: http://handbook.w116.org/.

Sure, it's for the W116 mostly, but it covers the M110 with both D-Jetronic and K-Jetronic systems.

Good luck.

by **Nutz** » Fri Dec 30, 2005 8:55 pm

1973_280E wrote:I'm at the tail end of a full engine reconditioning process for my w114 280E M110. Going through the engine testing phase we have found the fuel to be a bit lean. The 280E has 2 fuel regulators from what I can gather (one for in flow and one for out flow), making it difficult to tune the fuel pressure correctly.

I find that all the manuals available to me go out of their way to avoid the 280E fuel and injection system... so annoying!

Has anyone else had a similar experience in adjusting fuel pressure on this engine model? Anyone have some data on seting the pressure between the two regulators?

Set it at 30 psi ( 2 bar)

The regulator is adjustable from 28 psi to 32 psi and if you can't achieve this,replace. Good luck

by **OzBenzHead** » Sat Dec 31, 2005 12:59 am

G'day, Nutz!

Good to "see" you over here! Long way from Alaska! :lol:

by **Nutz** » Sat Dec 31, 2005 6:57 am

OzBenzHead wrote:G'day, Nutz!

Good to "see" you over here! Long way from Alaska!

Thanks for the welcome

Lurking was sort of boring :lol:

http://www.youtube.com/user/adow77 · by **ADow** » Sat Dec 31, 2005 8:01 pm

Great collection - how do you keep them out of the weather?

by **Nutz** » Sun Jan 01, 2006 11:14 pm

ADow wrote:Great collection - how do you keep them out of the weather?

3 of my W116's are stuffed in my garage,the rest except my 6.9 (heated storage)are dealing with the elements.

by **1973_280E** » Mon Jan 02, 2006 6:20 am

Thanks for the tips guys. I'll have to take it in to my mechanic again as I don't have the appropriate tools for checking the pressure.

Further to my previous explanation on the symptoms, the fuel pressure seems fine on starup. It's only once the engine has warmed up that the idle gets 'bumpy' and it starts to die on me.

Nutz, I assume the regulator pressure you mentioned refers to the one leading into the engine. Any ideas on what the one coming out of the engine is for (on the fuel return line, lower in the engine bay)? And what the effects of adjustments to this are?

by **Nutz** » Tue Jan 03, 2006 2:12 pm

1973_280E wrote:
Nutz, I assume the regulator pressure you mentioned refers to the one leading into the engine. Any ideas on what the one coming out of the engine is for (on the fuel return line, lower in the engine bay)? And what the effects of adjustments to this are?

Do you have a photo of the area on your M110? I haven't seen a D Jet setup on a M110 yet.Going by the setup on my M117's,the feed line goes to the first regulator then to the second one.I have no regulator on the return line,so I'm a bit confused :lol:

by **1973_280E** » Wed Jan 04, 2006 10:06 am

I'll have a look around for photos and get back to you. I took many photos during the engine dismantling stage. :wink:

I'm sure I've got a clear pic of it somewhere.

by **1973_280E** » Sat Jan 14, 2006 6:21 am

I managed to find a decent photo of the fuel setup. The green arrows show the fuel lines coming in and the red ones show the fuel exiting to the return line.

I can't find this setup in either the w114 or the w116 manuals

by **O319-coach** » Mon Jan 16, 2006 1:00 pm

Top one is the fuel regulator. Lower one is a damper.

You check the pressure by taking the line of the cold start injector and testing with the engine running.

by **1973_280E** » Wed Jan 18, 2006 3:15 pm

Thanks O319-coach. As Nutz kindly mentioned, the fuel regulator should be set at 30psi. Just for clarification, does the damper require some tweaking for setting the pressure as well? If so, what are the settings for the damper?

by **O319-coach** » Wed Jan 18, 2006 4:15 pm

30psi?? Are you working on an English car? Adjust to 2.0 bar.

The fuel damper is not adjustable.

by **1973_280E** » Fri Jan 20, 2006 6:54 am

Thanks John.

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