LIFT PUMP DELETE OX66 YAMAHA - FULL TUTORIAL (How to DIY) 

I love the detail! Very easy to follow and well explained! New subscriber!

Wow I have been searching high and low and couldn’t find a video I till I found yours and it was very helpful and informative great work like to see how it did in the water with a load

Great video. I have a 2003 o66x. Awesome engine but lift pumps go bad constantly.

Thank you so much for making this video. Absolutely perfect! 😊

Great video!!! Very well done.

Thank you for this video! I've just completed the conversion on my 250 2 trips so far and she's purring! A few tips to anyone looking to do this. Buy a waterproof pre wired relay assembly. 4 pin opposed to 5. ( if 5 pin is the only option, unplug relay, remove center yellow wire and connector rather than capping it. Seal the hole) They come with mounting screw. Which I fastened to the top pump block off plate. This minimizes wiring and keeps the bulk of it in the cowling. Wire a 30 amp inline fuse right off of the relay. Use heat shrink connectors and tinned copper wiring. As an extra failsafe in the event the relay fails. Use opposite connectors on the power in (30) terminal and the power out (87) terminal. If the relay fails you can manually connect the two wires so the pump will be on all the time. This will get you home. Also the block of plates, I Couldn't find them available online so make your own, 1in wide 1/4 thick aluminum flat bar, few holes (use old pump housing as a drill guide), just made rectangles, no need for curved shape(no sharp edges). Get a felpro gasket roll from the auto store use a hammer punch. Cost around $25 so Save ya some bones Also since I've no personal trust in the electric pump/ brand (Carter). It's performance, longevity in salty environment. I can't say much other than it is cheap enough so buy a second pump, double vacuum seal it along with the hardware and keep it on deck. It's important to pre wire the connectors the same as your in use pump. Hopefully you'll never need it, but it's a hell of an insurance policy for an extra $60 some bucks. Good luck, I'll be sure to update as time goes on.

Using mine for a year now , no issues . I keep a spare on the boat with bullet connections just in case . 02 225 vmax 🤘🏽

"Danger, Will Robinson!" The positive wire from the battery to the pump should be fused at the battery end. I didn't hear it mentioned in the video, and the write-ups I've read don't mention it either. But ALL electrical feeds from the battery should be fused as close to the battery as possible. What size fuse? The pump mfr should have a rating for this. The reason for locating the relay in a compartment separate from the gas is because a spark will jump from one contact to the other as the contact closes. Not a big deal unless there are fuel vapors at a combustible ratio in the area of the relay. The same reason not to operate a light switch if you smell natural gas. FWIW ... My HPDI 150 died on the way from the launch to the cabin when I put the pontoon in the water this year. I had to be towed home. I suspect the LP pumps and ordered two before seeing this. This change likely will occur later when taking the boat out of the water. Thanks for the video! Nice job.

PAINLESS WIRING makes a GREAT fuel pump relay kit that I have used in several remote pump installs on outboards. It's a very nice kit and it is $40 and saves a lot of the pains you went through as well as providing a way to mount the relay more solidly. The CARTER pump is a fantastic pump and will probably last longer than the boat.

excellent video, can you put a link to the fuel pump, they usually go by gpm I think?

Are you planning on doing a follow up video and how is this mod working at wot?

I need those plates to cover the vacuum holes Can you put a different link?

Having issues with my ox66 where can I get this pump and plates to cover vacuum holes

Hey brother, been looking for an ox66 to put on a project and came across your videos. These are really great breakdowns…. I have a question about this diaphragm pump system…. why would the factory even design the motor for three diaphragm pumps when all it takes, is one pump to get it up to the VST tank… is it because it’s cheaper and manual vacuum…

To clear it up. Fuel line engine side is 5/16"

Hello, I have a Yamaha Ox66, year 2002, I would like to remove the lift pumps on its engine. It worked fine. How can I get the sheets to seal where the pumps go? Thank you.

Hey, my fuel tank is at the front of my boat, about 15 feet from the motor. Would this pump be able to pull the fuel with no problems?

I suck at electrical, so... I'll ask what's probably obvious to everyone else. I know you used 10 gauge on the relay, but the copper wire trigger running from the VST, what are the specs on that wire? Also, what size fuse did you use for the in-line power wire to the relay? Thanks

If youre worried about the fuel line being under pressure use a fuel injection hose and double clamp it

Is this something needed on just the regular carbureted version? I have a 2001 Yamaha VMAX 150 with the TRP. Serial number is V150TLZR Can someone tell me if this is used on my motor aswell?

If Yamaha would simply change the fuel pump diaphragm material to Viton in lieu of the cheap BUNA-N rubber I believe the fuel pump issues would be resolved. The exposure to ethanol is causing the problem.

Anxious to see how it works for you after running it a while. Do you have specs for the pump? I’ve seen a couple variations of this and seems to me they had a return line to tank. Thanks for showing this in great detail.

I have had a lot of issues with these pumps. Going to do the conversion. Wish you would list the parts you used in the description so there is no question about what to buy.

Just did this. Connected the trigger wire from the fuel pump to the trigger wire on the high pressure pump. 1 week later. No power to either pump. Got any ideas?

first of all great video You have an awsome way of explaining stuff step by step also I noticed that you dont use ear muffs, is running water to the top with the flush hose safe for the motor and the impellar I have heard that yamaha does not recommend it do you have any comment I would appreciate it thanks

The pump inside any compartment on a boat is an extreme fire hazard as the fuel line is now under pressure & if you have any leaks you're going to fill that area with gas!! With the original vacuum pump system your fuel lines are under a vacuum so if you get a leak you'll suck air! Personally I've never had a problem with the low pressure pumps & I have 3 outboards that use them. The pumps are easy to service & you can buy rebuild kits that are fairly cheap!

Can you give more info on the pump where can I buy it and what price they range thanks.

Wonder if this can be done on a regular HPDI

Guess its ethanol causing those issues man my OX66 pumps last 8years

What kind of pump do I need?

Has anybody tried the delete with carb motor?

Where do you get the little metal plates and gasket to seal?

Do you have a link for the fuel pump?

How is this working currently after 9 months