Volvo Penta Fuel Pumps

Where did the idea of paint inside of the rail or pump come to you?
Would it be red or brown in color?
Your talking about the electric fuel pump the size of a big cigar?

Fish
There really is paint on the insides of these gas system?
Every time I get involved with the GM MPI stuff it's full of rust.

Ohoa; That fuel gizmo. I'm used to the electric fuel pumps the size of a big cigar.
I don't work on newer gas engines.
Afraid I'm a lil more behind the times than I thought.

The timing of this thread is most interesting for me. I don't work on gas engines and avoid them like process servers.
However, the facility manager at my faverate marina taped on me to fix his boat after I started following this thread.
Yep, electric fuel pump but not a big paint issue.
2010, stb, 6.2 Merc Horizon mpi. Gen III water cooled fuel pump assembly.
Lift pump and pressure pump in same gas floded chamber of a sea water cooled case with built in paper secondary fuel filter cartridge.

What a f * (foul) up.

The low hour, brackish water only use, water passages in the fuel block is long and completely clogged with corrosion. No cooling action.
The plastic press in fittings and seals are no longer available. You are suppose to buy the new design whole assembly, with screw in plastic fittings.
I'll be trying to tap a thread my self tonight and extract 1 top cover machine screw.

These electric pumps get hot (hence water cooled packages).
Remove the water, pass thru a no wake zone or idle the engine at the dock, that fuel gets hot.
Turn it off and let it sit, repeat every 2-3 weeks for a couple of years.

What I found is the fuel (same marina, Valve Tech for many years) starts dropping it's additives in the hot fuel pumps chamber.
These additives combine and form a crystalline shape but in my fingers compressed it like a "gummy bear" and would smear like near clear peanut butter. Just sitting on & not attached to the alloy bottom of the pump chamber. I'm not upset with the fuel, just the pump design.

You can see the goo trail to the HP pump bottom pick up. With no screen (like the LP pump), it drew this goo up and failed the HP pump.

The port side was running but I pulled it down also. Yep, water restricted, goo (more clear, not cooked as bad vs port) just about to get to the HP pump.

I started cleaning them out last night.
Under the top mounted, vacuum controlled fuel regulator, I did find where the paint had flaked & goo'd up. I can see that this area is subject to wet gas, then fume gas and when the filter is serviced, air.
I can tell the housing hung at an angle when spray painted. I can see the spray pattern on the top that held the regulator.
I sense where the paint was thin, there was no (paint) problems, where it puddled just a micro amount on the pump cover recess the paint failed.
I am sure if alcohol laden fuel was involved, I'd see more paint messed up.

Took all night to get that gas fume smell from my snoz. Today I jump back into my perfumed scented (diesel) boats.

Pictures on next post.

10 year old gas tank is clean. you can still see hand written notes on the bottom.

Broken fitting and water passage clogged.

Goo in chamber bottom.

This was inboard, but same engine.
Somewhere, somehow, soon the engine marinizers have to get their act together and return back to simple and reliable engines. Get the junk of the motors.