installing new copper crush washers on fuel pump/filter assembly - how tight?

[HuskyMan]

On the 1991 560SEL, I am installing a new check valve plus new copper crush washers on every fitting of the fuel pump/filter assembly. The check valve screws into the fuel pump, what spec should I torque it to? Then, what torque spec should the 17mm acorn end nuts be? Thank you for your input......

[HuskyMan]

Bumpety bump, I'm really needing to know the torque specifications for these copper crush washers if anyone has access to the factory service manual for W126 cars. Anyone?

[Marcel107]

Hi,

there are no Torque values for this job in the service manual. I have checked this for R 107, C 124 und for the W126

Best regards from Germany
Marcel

[HuskyMan]

Thank you for the reply. I'm assuming I should tighten the 17mm bolts "good-n-tight" and reinstall the pump/filter assembly on the car?

[Two560Two]

Just make sure you use new washers and inspect the washers real good before installation. I actually tightened a few too tight which cause the copper washers to develop a crack and cause fuel leaks.

[HuskyMan]

Thank you for the advice; I will be careful not to over tighten. This entire ordeal has given me Excedrin Headache #57 (tired of lying on back looking at the underside of an automobile while straining to position work light so that I can see the problem and then attempt to figure it out).

[TnBob]

For $10 or so ... you can get an LED spotlight which takes all the light issue away from changing the fuel filter. Came in great on my 89 300E.
The nuts should be free.