1977 Johnson 85hp 85EL77S Fuel pump

[brianc31525]

I have a 0318374 D4 fuel pump on my 85. It uses three mounting screws. top and 2 bottom. I cant fine references to my part number everything brins up a 2 bolt mount. My Seloc book says it should be 2 screw as does everyone else. 0438559 is what everyone says replaces it. Ok not trying to find mine anymore and am building an adapter plate to mount to. What I want to know is why is everyone saying this and I have that literally in my hand. Something doesn't add up and I'm trying to find out what? My pump is OEM. Other pump is OEM and much different. As you see its bigger.

 

[F_R]

I dunno, there seems to be confusion among 1977 models.

 

[F_R]

There seems to be a difference in the pulse hose / location. The ones you show have three hoses, Plus the smaller one also has a back feed which probably is blocked off in your situation (??)

1978 parts book shows only two-hoses plus the back feed.

 

[brianc31525]

Well six months later and my land yacht awaits. I need help finding this pump yall. Prestine 40 year old motor side-lined by cant find correct fuel pump is completely pitiful especially given everyones yrs of exp. and working on them. Think people think.

 

[racerone]

The easiest repair / solution is to replace ( make one ) the diaphragm in the original pump !!------Nothing to it.----These pumps all work the same way !-----Only thing that can go wrong is the diaphragm.----Just using 2 screws to mount it works fine as well.

 

[brianc31525]

If I use just 2 screws that mount on small tab off of my silencer I worry about the vibration cracking or breaking off entirely. I've welded basically all my life 3rd generation. Grandfather, dad, and me. So I know it won't take much to break tab off silencer. I've worked on 60's, 70's year model motors and never seen one with just 2 screws all had 3. Also it being bigger what is that going to do to my fuel pressure, bigger pump on same vacuum will put out more displacement then u get into having to rejet carbs and I don't want to tackle that headache. I have been trying to find out why its different because there is a reason for it just nobody can tell what that is and I've talked to some of the more experienced folks here in town and they are stumped. Even talked with mechanic at a boat dealership about it and he didn't know. Every time I walk out my door there she sits. Never had this much problems finding out info. Even Seloc book says my motor has 2 screws but it has 3 from the factory nothing aftermarket on her. Really getting down in the dumps over this. Im 43 so the old timers are becoming fewer and fewer. All that knowledge.

 

[racerone]

Just replace the diaphragm on the original pump.-----Or simply install the new pump with 2 screws.-----It will work just fine.-----No need to overthink this simple stuff.---And the pump works with crankcase PRESSURE and not vacuum !------Sorry

 

[hardwater fisherman]

There are several rebuild kits available on EBay that I think should work.

 

[racerone]

There are numerous ways to solve this issue.----Make an adapter plate to mount the pump with 3 screws.----Mount the pump in a different location.-----Or mount say a 1966 100 HP style pump that has a sediment bowl and filter.----No need to fret over something as simple as this fuel pumping issue.

 

[brianc31525]

There are numerous ways to solve this issue.----Make an adapter plate to mount the pump with 3 screws.----Mount the pump in a different location.-----Or mount say a 1966 100 HP style pump that has a sediment bowl and filter.----No need to fret over something as simple as this fuel pumping issue.

finally after months of hunting i found Offshoremarine.com out of Sarasota Fl that actullay sells rebuild kits and from the pics im seeing everything is just like what i have. 3 screws also. getting in touch with them later today. Oh by the way OMC means you dont have to do crap to it for it to work. Original Equipment means something. this is a prestine motor with prob less than 40 hrs on it and nvr seen salt water. Im gonna fret cause i want it to be completely orginal. A prestine 40 yr old boat motor that has nothing wrong and still looks new. Bump the key and shes running. I take pride in the work that i do.

 

[racerone]

Everybodey works to different standards I guess.----And sorry ----I can't believe there was such an issue in the repair of these PRESSURE operated simple pumps.-----The only thing that can fail is the diaphragm.-----An item that is easy to make !!

 

[brianc31525]

Everybodey works to different standards I guess.----And sorry ----I can't believe there was such an issue in the repair of these PRESSURE operated simple pumps.-----The only thing that can fail is the diaphragm.-----An item that is easy to make !!

Yes they produce pressure created from crankcase vacuum just to clear that up.

 

[brianc31525]

I have had issues with Amazon and E-bay sending the wrong part # numerous times. I don't trust em more than I can throw them.

 

[racerone]

Sorry.-----When the piston comes down the PRESSURE develops in the crankcase.-----That squeezes the spring and pushes fuel into the carburetor..-----When piston goes up in the cylinder PRESSURE drops and the spring pushes on the diaphragm.-----That action pull fuel from the tank.-----As simple and reliable as it can be !!

 

[brianc31525]

Just wondering if anyone looked into this anymore. Still cant find a rebuild kit, i literally have 6 of these exactly same pump withe a 40 yr old diaphram. I think im gonna go a new pump. I go offshore in it and peace of mind is priceless when you can't see shore in a 18' boat. Have VHF for emergency but its the closest reef. 20 miles. Also what happens if you gut the vernatherm guts and replace cover. I couldn't get it to install with the powerhead on or without dropping the cowling somehow. Any help?

 

[racerone]

There are different fuel pumps that work well on your motor.----I do not know what is on your motor at the moment.----Easy to fix in my opinion.

 

[brianc31525]

I have a pump off a 76 atm but it's in the same shape as my 5 others. Diaphragms are gone. New pump is slightly bigger but they say its not even after i sent them side by side comparison. My pump has been through 5 different revisions

 

[brianc31525]

I guess im gonna bite the bullet and buy a new pump. I need to order 2 coil packs as they are oozing out. 200 bucks still a good way from 1000. Lol