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Old 02-03-2018, 09:18 PM
E300d 1995
Join Date: Jun 2017
Location: Near Lake Texoma
Posts: 225
95 E300D W124 om606 injection pump overflow bolt for banjo fitting

I spent a few hours looking for a 3/8 check valve I could put inline between lift pump and filter. Most were aluminum which can corrode. Others were bulky.

One link mentioned that the overflow bolt on the Mercedes diesel was actually a check valve that was intended to help prevent long cranks by preventing fuel to return to tank.

If so, maybe I just need a new overflow bolt. Some threads say some bolts are rebuildable but spring can't be ordered just stretched.

Is this pretty much the way it is?

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Old 02-03-2018, 09:35 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
I think for ‘95 the bolt is sealed so you can stretch or replace the spring. You should be able to retrofit an older (616/7) bolt which IIRC is no longer available new. Someone on the forum made a custom bolt with adjustable pressure.

98 E320s sedan and wagon
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Old 02-03-2018, 11:08 PM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 5,132
Having used the 617 bolt on a 603, I wouldn't suggest that route. The 60x injection pumps use a self-bleeding fuel system with a different type of banjo bolt. The "check valve" in them is a very basic disc style valve with a very weak spring on it. The pressure restriction is due to a drilled orifice rather than spring tension. The 61x style bolt is a traditional check valve where pressure is regulated by spring tension. Since there is no primer handle on the 60x engines, any air that gets caught in the IP will not be bled out and can cause long cranks or rough starts. If you suspect the valve in your banjo bolt has failed (and they do fail), buy a new one, they aren't that expensive.

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