What color is on there now?

I think my 85 Federal has black. I know for sure that the green is NOT what you want, thats for the 722.315.

Make sure you have tried replacing the cap and o-ring on the modulator before you replace the whole thing (unless you know its broken for some other more obvious reason).

And when you put it in, check out the modulator adjustment article in the Wiki. You need to set the right pressure on it when you put it in.

dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car