New here with a suspected high pressure pump problem

[stefuel]

I have been crowned the neighborhood Mr. fixit. Every time someone has a problem I seem to somehow get involved. Two days ago it was the gas station down the street. their very expensive digital tire balancing machine broke and the dealer is no where to be found. Two hrs and a couple of circuit board component later and everyone is happy. Today it's my neighbor behind me. He's trying to sell his unused boat to help pay for his grand daughters scool expenses. It's a 50 HP Evinrude, model# E50PL4SS. I do believe I have narrowed it down to the high pressure fuel pump. The priming bulb works. The lift pump pumps gas to the inlet of the HP pump. I have 12 vdc to the pump with the key on. No noise from the pump and no fuel at the pump outlet. I ohm'd the contacts on the pump and show "open line". Shot some gas into the intake and it started right up. I knew I had a fuel problem so I followed it until it stopped. That was at the outlet of the HP pump.
BUT before I have him order a almost $400.00 part, I thought I would ask here to make sure I'm not missing something. Also it looks like the intake manifold needs to come off to change it. What else should I order if the pump needs to be changed? Thanks,
Chip

[stefuel]

Well that was fun. The design of this is less then well thought out. To even consider inspecting the strainer on the bottom of the electric pump requires removal of the intake manifold. Anyway it is now apart and the fuel/vapor seperator is apart and cleaned out. There was quite a bit of junk in the bottom but no water. I bench tested the pump motor and it is dead. I have found that I can buy just the pump motor and swap it into the old pump housing for about a 3rd the cost of a upper pump ***embly. I'm not sure how to test the pressure regulator in the bottom, so I might just change it while it's apart. So other then the pump and regulator, I think the only other things I will need is the pre-formed O-ring for the housing and the intake manifold gasket. Until I get pressure to the fuel injector rail I can't test further.

[stefuel]

Well it's been a week and I haven't seen anyones questions replied to by the "pro" and those who hope to sell you the parts you need so I'll be moving on. An interesting observation with this outboard. It's branded Evirude, built by Suzuki with Mitsubishi parts. What's the world coming to?

[Michael P]

High pressure fuel pump

Same problem. Why do these pumps burn up? Is it from over cranking when starting? Is there anyway to revive this pump without removing it?

[Joe Reeves]

Originally posted by Michael P View Post

Same problem. Why do these pumps burn up? Is it from over cranking when starting? Is there anyway to revive this pump without removing it?

I just noticed that this post is 4 years old and has become activated by another boater. MY reply is intended for the original poster (Stefuel) which no doubt has moved on by now.

Michael... If you intend to continue on... Start a new post under your own title and name.

I have hesitated to reply due to the fact that I retired in 1991 and the engine you speak of is a 2000 model. Naturally the model you speak of would be a foreign design to me in appearance and circuitry... however.........

That engine would normally be equipped with a rather large black plastic combination fuel/oil pump called a VRO pump (Variable Ratio Oil), having three fittings on the bottom for "Engine operating pulse, Incoming Gasoline, Oil" and one on the top area for "Outgoing fuel/oil mixture". The wires located at the rear pertain to the warning system should the pump malfunction.

If you have been connecting a 12v source to the various electrical terminals of a VRO pump, that may have destroyed the warning sensor.

Do you have the pump mentioned above... OR... has this engine been converted to a regular known electric fuel pump setup whereas the operator/owner premixes the gasoline/oil to a 50/1 mix (1qt of 50/1 oil to 6gal gasoline)?

If the pump is a VRO, no fuel would be drawn into and fed out unless the engine was running... and even then (notice the one hose at the bottom that connects to the crankcase) as the engine runs, or simply is being cranked over via the electric starter, the downward force of the piston pressure blown out the hose leading to the VRO which operates the VRO must be of suitable force.

If the piston is faulty, that force of pressure will of course be affected.

Get back to me, let me know if this has been of any help to you. Note that another forum that I write upon that has many knowledgeable members of which I suggest you join is MarineEngine.com .

Just keep it as simple as possible... what is the engine doing or not doing?