280e fuel pressure problems

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280e fuel pressure problems

Postby 1973_280E » Mon 26 Dec, 2005 12:04 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?
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Postby OzBenzHead » Tue 27 Dec, 2005 11:11 pm

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.
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Re: 280e fuel pressure problems

Postby Nutz » Fri 30 Dec, 2005 7:55 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) 8) The regulator is adjustable from 28 psi to 32 psi and if you can't achieve this,replace. Good luck
Last edited by Nutz on Sat 31 Dec, 2005 5:56 am, edited 1 time in total.
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Postby OzBenzHead » Fri 30 Dec, 2005 11:59 pm

G'day, Nutz! :)

Good to "see" you over here! Long way from Alaska! :lol:
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Postby Nutz » Sat 31 Dec, 2005 5:57 am

OzBenzHead wrote:G'day, Nutz! :)

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


Thanks for the welcome 8) Lurking was sort of boring :lol:
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Postby ADow » Sat 31 Dec, 2005 7:01 pm

Great collection - how do you keep them out of the weather?
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Postby Nutz » Sun 01 Jan, 2006 10:14 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.
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Postby 1973_280E » Mon 02 Jan, 2006 5:20 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?
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Postby Nutz » Tue 03 Jan, 2006 1:12 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:
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Postby 1973_280E » Wed 04 Jan, 2006 9:06 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.
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Postby 1973_280E » Sat 14 Jan, 2006 5:21 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.

Image

I can't find this setup in either the w114 or the w116 manuals :(
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Postby O319-coach » Mon 16 Jan, 2006 12:00 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.
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Postby 1973_280E » Wed 18 Jan, 2006 2:15 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?
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Postby O319-coach » Wed 18 Jan, 2006 3:15 pm

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

The fuel damper is not adjustable.
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Postby 1973_280E » Fri 20 Jan, 2006 5:54 am

Thanks John. 8)
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