Offshoreonly.com - Fuel in Sea Pump Gear Lube

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Cory H

03-04-2018 12:59 PM

Fuel in Sea Pump Gear Lube

2 years ago I replaced my 502mpi mechanical fuel pumps and put new bearings and seals on the sea pump housings.
I pulled pumps to put in New impeller kits yesterday and change gear lube. My STBD pump has quite a bit of fuel mixed with gear lube.
I would not think the mechanical pump woyld be bad already with about 120hrs of use. I thought I had read somewhere here a bad VST diaphragm could send fuel to sea pump. Is this possible?

Griff

03-04-2018 01:05 PM

Some fuel in the mechanical pumps is pretty normal. I've never had one that didn't get some fuel dilution in the lube.

Brembofreak

03-04-2018 01:16 PM

Best is to change Oil all 20-25 hours! Michael

sutphen 30

03-04-2018 04:28 PM

I'd be looking at the diaphragm of the fuel pump.

dunnitagain

03-04-2018 05:59 PM

Happens all the time , change it when you change your oil.

Young Performance

03-04-2018 06:28 PM

As mentioned, they all do it. I recommend to my customers to change it every 25 hours or so.
Eddie

Cory H

03-06-2018 10:49 AM

Can the VST diaphragm send fuel to sea pump, or only the mechanical pump?

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