5.0 fuel system

[RustedNutMedia]

Whats up guys and gals. I have a 1994 Larson with a 5.0 GL I believe. I'm trying to piece this thing back together and have a few questions. I'm hoping someone maybe has an answer or a website I can check out. I'm deleting the Mechanical fuel set up. I'm running a Holley 2 bbl carb and I have a 4-7 psi electric fuel pump. is the only other thing i will need is the Block off plate for the engine block? Can i leave the mechanical pump in place while i attempt to get this engine running? Thanks for the help ahead of time. If you have any useful websites I could check out that would be great also.

 

[Scott Danforth]

No

dont leave the mechanical pump hooked up or installed. why are you replacing the mechanical pump for electric? it cant be price, because a marine electric pump is $90 where a marine mechanical pump is about $50 . It cant be for reliability.

in fact the mechanical pump will be less trouble than an electric pump. did you get a marine electric pump? do you have the oil pressure switch wired to it for safety reasons?

 

[rat boat]

No. Use a mechanical pump. Buy a new one and use it. It will work if you lose electrical, it won't over pressurize. To properly block it off you need to Take a shaft, two gears and a key out. And mechanical pumps work faster as you rev and won't sink your float and flood the engine at idle. Also, you will have to rig it direct to power output because you want it to start and stop with the engine, you will also need to make sure you can spare the amps on startup, Becose most go back into the starter.

 

[RustedNutMedia]

No

dont leave the mechanical pump hooked up or installed. why are you replacing the mechanical pump for electric? it cant be price, because a marine electric pump is $90 where a marine mechanical pump is about $50 . It cant be for reliability.

in fact the mechanical pump will be less trouble than an electric pump. did you get a marine electric pump? do you have the oil pressure switch wired to it for safety reasons?

Scott, I have been seeing your name pop up every where i look on this forum. So here is the run down I bought two identical boats. They are both basket cases. The boat I am trying to get run has a new long block, new carb and the heads have been refreshed as well. It is missing a lot of parts. But for the price i paid for both of them it was worth it to buy them. I mainly boat on local lakes and the boat is never stored on the lake unless we are on a sand bar. I'm in Texas as well so our boats hardly get winterized. We tend to use a lot of automotive parts. The electric pump is off of one of my other projects. So it was just easy to grab. I'm trying to get this guy to run on the ear muffs and see what parts are needed before I buy the proper parts to get it out on the water.

 

[RustedNutMedia]

No. Use a mechanical pump. Buy a new one and use it. It will work if you lose electrical, it won't over pressurize. To properly block it off you need to Take a shaft, two gears and a key out. And mechanical pumps work faster as you rev and won't sink your float and flood the engine at idle. Also, you will have to rig it direct to power output because you want it to start and stop with the engine, you will also need to make sure you can spare the amps on startup, Becose most go back into the starter.

Sounds like it will just be easier to buy a new mech pump.

 

[Scott Danforth]

So here is the run down I bought two identical boats. They are both basket cases. The boat I am trying to get run has a new long block, new carb and the heads have been refreshed as well. It is missing a lot of parts. But for the price i paid for both of them it was worth it to buy them.

BTW, basket case boats are not a way to save money. they are only slightly cheaper than "free" boats which are the most expensive boats in the world.

I mainly boat on local lakes and the boat is never stored on the lake unless we are on a sand bar. I'm in Texas as well so our boats hardly get winterized. We tend to use a lot of automotive parts..

Two giant red flags. it gets to freezing temps in Texas as well as florida, and Automotive parts should never be used unless its base engine parts. Fuel system and Ignition system MUST be marine to prevent you from blowing yourself up.

The electric pump is off of one of my other projects. So it was just easy to grab.

Unless its an SAE J1171 compliant marine pump, dont use it. its not iff you blow up, its when you blow up.

I'm trying to get this guy to run on the ear muffs and see what parts are needed before I buy the proper parts to get it out on the water.

you could use a squirt bottle of fuel and fill the carb bowl. it would run for about 3 minutes on the fuel in the bowl. no money spent.

you could also disconnect the line from between the tank and fuel filter and put it into a small fuel can. again, no money spent

I would pull the hose from the AF valve on the tank and drop it into the 1 gallon weed can you use for your lawn mower.

 

[RustedNutMedia]

BTW, basket case boats are not a way to save money. they are only slightly cheaper than "free" boats which are the most expensive boats in the world.



Two giant red flags. it gets to freezing temps in Texas as well as florida, and Automotive parts should never be used unless its base engine parts. Fuel system and Ignition system MUST be marine to prevent you from blowing yourself up.




Unless its an SAE J1171 compliant marine pump, dont use it. its not iff you blow up, its when you blow up.



you could use a squirt bottle of fuel and fill the carb bowl. it would run for about 3 minutes on the fuel in the bowl. no money spent.

you could also disconnect the line from between the tank and fuel filter and put it into a small fuel can. again, no money spent

I would pull the hose from the AF valve on the tank and drop it into the 1 gallon weed can you use for your lawn mower.

Oh yeah. I know its going to be a money pit. I bought both boats right. I'm pulling carpet and the interior this weekend. to prepare for rewiring/paint luckily the transom and floor has been redone by a good shop in my area. Its getting a 100% make over. I'm actually contemplating just pulling the motor out and getting it running on the stand. For some reason I didn't even think of just filling the fuel bowl. Either way it looks like replacing the mech pump will be the easiest and safest way. Luckily I have every piece of paper work on this boat I am working on. Thats the main reason I took on this "project".