MFI fuel filter

why is the MFI fuel filter so large (& costly) compared to a CIS fuel filter?

Because the super fine machining and fit in the injection pump can’t have any contamination.

I have found that the replacement filter elements are not doing their job. I recommend adding an additional filter somewhere.

Quote:

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Originally Posted by BURN-BROS

I have found that the replacement filter elements are not doing their job. I recommend adding an additional filter somewhere.

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What issues are you finding? Is the filter element breaking down, etc?

That foreign material is getting thru. So it's just an expensive nothing at this point.

Quote:

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Originally Posted by BURN-BROS

I have found that the replacement filter elements are not doing their job. I recommend adding an additional filter somewhere.

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I added a filter between the tank and the fuel pump. Protects both fuel and MFI pump.

That's Typically what I do. I also add a small see thru filter in the engine bay between the filter console and the return line. It gives me an idea if I have a problem and is relatively safe as there is no pressure there.

Is Bosch still making these filters. I heard they were NLA, so I bought three in 1998 while they were still Bosch. What are they now?