Mercury in-pump fuel filter

[mwnitz]

I just purchased an OEM style replacement filter for inside my fuel pump: Quicksilver part # 35-803897Q 1.

2 questions:

1. Does anyone know how many microns these OEM filters are rated for?

2. Any water seperating qualities to this filter? There's a yellow stick on label that calls it a "filter kit fuel water sep Merc", but it it not on the original packaging. It does however have the correct part number on it.

Thanks.

 

[Rocky_Road]

Re: Mercury in-pump fuel filter

I just purchased an OEM style replacement filter for inside my fuel pump: Quicksilver part # 35-803897Q 1.

2 questions:

1. Does anyone know how many microns these OEM filters are rated for?

2. Any water seperating qualities to this filter? There's a yellow stick on label that calls it a "filter kit fuel water sep Merc", but it it not on the original packaging. It does however have the correct part number on it.

Thanks.

These filters have never been known to stop water...but your added sticker would suggest that this has changed.

Downside would be the small amount of water that could be trapped, before the filter would be saturated and fail to stop any more. The in-line canister style has become a 'must' with the ethanol-spiked gas out here. The oil filter sized ones come as either 25 or 10 micron normally.

Happy boating!

 

[Grumman59]

Re: Mercury in-pump fuel filter

Even if it did trap some water, it wouldn't be much. It's just too small.

I had a severe water in the gas problem a while ago and that was just after I'd installed a new Mercury in-pump filter. Best to get a proper in-line water separator with a screw-on canister. They work.

 

[JustJason]

Re: Mercury in-pump fuel filter

1. its not much, maybe 100 microns, but thats just a guess. They do not filter as tightly as canister filters.

2. No, no water seperating in the little filters that fit in the pump. Water is not seperated by a filter or filter element per se. Water seperates from fuel because it falls out of suspension when sitting inside of the fuel canister itself. When fuel flows through the gas line it flows through at a quick rate. When it hits the canister that rate slows down, and lets the heavier water settle down to the bottom of the filter.