This is what I done to mine. Replaced the carb with a true mikuni slide carb 38mm. Installed an electric pump just as you did, only I installed an adjustable fuel regulator so it doesn't flood the carb with excess pressure. I also used a relay to power pump instead of powering pump directly through key switch. This will help key switch last allot longer plus prevent smoking wires (fire hazard). This is how big industrial motors are ran. Use small power to control big power. In the case of boats it is dc power which is harder to switch than ac power. Enjoyed your video. Always something to learn. Thanks.
Thanks for watching, The relay is a great idea I believe I'll try it. I have a 38 Mikuni will be installing soon. Going to try to put out the exhaust video this weekend. Keep your eyes open for it.
As to the pump and regulator, I used an old Holley canister or in line pump I had from an old hot rod I had years ago. Not a racing one, just one that would feed a quadrajet. I had an old napa brand reg from back in the day with a pressure port for a pressure gauge. It is regulated to around 2 psi. Your set up may have different requirements depending on carb, cam, heads, etc. My engine is NOT stock by any means. It operates from 5 to 6000 rpm but it's still only two cylinders and too much pressure overcomes the float seat and will flood the carb. I'm sure you can find these two items at any AutoZone, advance, O'Reilly's, etc. You will probably have to experiment with your engines pressure requirements at idle and WOT to see how much it needs to keep engine from starving from fuel. Here's a freebie. Mount the fuel pump as close to your fuel tank as possible, as some pumps don't like to much suction head. Obviously take all precautions to make it intrinsically safe. (No sparks.) I would give you guys some part numbers but they're are all wore off. 🤷 Good luck and most of all have some fun.
Thanks for watching. I was showing the process I used, there are alot of variables in tuning a carb. The number of turnes could be different depending on altitude barimetric pressure dewpoint in the air etc. I think you just tune until you are happy with the performance. thanks again for watching
I don't have the part number but it was the only low pressure precision pump Oreilly had. It was either that one or the Edlbrock I would suggest planning on replacing either one at least once a year especially if you run it much at all. Thanks for watching.
Sweet I got mine on a 1444 monark 670 with an old Dixie surface drive frame still trying to find that sweet spot in my trim but hopefully I start seeing some speed soon I’ve only hit 16 so far I know it’s got more than that
What did you do with the crankcase tube that ran the OEM pump? Did you just leave it venting to atmosphere? I’ve got a built 670 with a 34mm Mikuni flatslide. I’m running an electric fuel pump along with the OEM pulse pump. I’d like to just run directly from the electric pump to the carb, but I’m not sure what to do with the crankcase tube. Any advice?
My late uncle was a veteran ❤
This is what I done to mine. Replaced the carb with a true mikuni slide carb 38mm. Installed an electric pump just as you did, only I installed an adjustable fuel regulator so it doesn't flood the carb with excess pressure. I also used a relay to power pump instead of powering pump directly through key switch. This will help key switch last allot longer plus prevent smoking wires (fire hazard). This is how big industrial motors are ran. Use small power to control big power. In the case of boats it is dc power which is harder to switch than ac power. Enjoyed your video. Always something to learn. Thanks.
Thanks for watching, The relay is a great idea I believe I'll try it. I have a 38 Mikuni will be installing soon. Going to try to put out the exhaust video this weekend. Keep your eyes open for it.
What fuel pump and fuel regulator did you use?
@@camerongliganic7333 the pump is a Precision low pressure from Oreilly no regulator.
As to the pump and regulator, I used an old Holley canister or in line pump I had from an old hot rod I had years ago. Not a racing one, just one that would feed a quadrajet. I had an old napa brand reg from back in the day with a pressure port for a pressure gauge. It is regulated to around 2 psi. Your set up may have different requirements depending on carb, cam, heads, etc. My engine is NOT stock by any means. It operates from 5 to 6000 rpm but it's still only two cylinders and too much pressure overcomes the float seat and will flood the carb. I'm sure you can find these two items at any AutoZone, advance, O'Reilly's, etc. You will probably have to experiment with your engines pressure requirements at idle and WOT to see how much it needs to keep engine from starving from fuel. Here's a freebie. Mount the fuel pump as close to your fuel tank as possible, as some pumps don't like to much suction head. Obviously take all precautions to make it intrinsically safe. (No sparks.) I would give you guys some part numbers but they're are all wore off. 🤷 Good luck and most of all have some fun.
im a veteran and first responder both fire and ems thanks for your videos there were a lot of help
I'm glad to hear it was helpful. Thank you for watching
this is a common problem with these engines, the stumble. Back both jets in carb out 1 turn
Thanks for watching. I was showing the process I used, there are alot of variables in tuning a carb. The number of turnes could be different depending on altitude barimetric pressure dewpoint in the air etc. I think you just tune until you are happy with the performance. thanks again for watching
Did you build that surface drive?
No it was a mud nuddy
Is there a link for the fuel pump you got from o riellys
I dont have a link to the pump but it was a basic low pressure pump. I just didnt want to go with the same one I puled off.
Do you have a part number for the fuel pump
I don't have the part number but it was the only low pressure precision pump Oreilly had. It was either that one or the Edlbrock I would suggest planning on replacing either one at least once a year especially if you run it much at all. Thanks for watching.
What size boat and what kinda speeds are you seeing
It's a 1648 i'm getting 23 to 24 empty
Sweet I got mine on a 1444 monark 670 with an old Dixie surface drive frame still trying to find that sweet spot in my trim but hopefully I start seeing some speed soon I’ve only hit 16 so far I know it’s got more than that
What did you do with the crankcase tube that ran the OEM pump? Did you just leave it venting to atmosphere?
I’ve got a built 670 with a 34mm Mikuni flatslide. I’m running an electric fuel pump along with the OEM pulse pump. I’d like to just run directly from the electric pump to the carb, but I’m not sure what to do with the crankcase tube. Any advice?
I want to say I left it open its been a little while
Did you ever figure out what to do with the crank case hose?