VRO to twin pumps

[jlds913]

So some of you might know that my engine has been giving me a few issues. I have narrowed it down to a fuel pump. I have decided to go with the 1983 twin pumps and do away with the vro all together. Only issue I see here is attaching the pulse like to both pumps. Can someone explain this to me or put me to a thread with info on it Thanks

 

[TrueNorthist]

Re: VRO to twin pumps

To save us all from having to hunt through your past posts could you give a model number?

 

[jlds913]

Re: VRO to twin pumps

Sorry must have forgotten, Its a 1985 Johnson gt 150. Model J150stlcos

 

[Daviet]

Re: VRO to twin pumps

I don't any experience with the larger engines, but I believe the pumps are each driven by crankcase pulse, probably on the bypass cover.
I am sure some one with more experience with your engine will come along and offer a better answer.

 

[pn]

Re: VRO to twin pumps

i just put a tee fitting on my single pulse line. i.d. as big as i could get and used stiff hose otherwise your hose will just pulsate.

 

[jlds913]

Re: VRO to twin pumps

Thats what I was thinking about doing. Do you remeber the size hose that was used? Also do you have a pic of how you mounted the pumps?

 

[pn]

Re: VRO to twin pumps

i bought multiple pumps from different sources, used whatever came with the pumps, just like your pulse line off your motor right now, still good. Note: use the pulse line for pulse, fuel line for fuel inspect the pulse line inside before cutting. . a little embarrased that i just used zip ties. you could fab a mount, i too lazy.

 

[keefallan]

Re: VRO to twin pumps

Your block has the other pulse line capped off. Unthread the fitting and purchase another of the same fitting for the vro and put teflon paste or tape when you put it in. Then you have the two pulse fittings for dual fuel pumps. The fuel pumps mount right on the block. You don't need to fabricate anything. The block already has everything you need. You just need to get the appropriate length 10-24 screws to mount them. I have put fuel pumps on a 85 v6, 84 v6 and this 89 v6 that I will re-build will have dual pumps on it. You can purchase all the shaped hoses from evinrude. The curved headed ty-wraps are all that are needed for it. The hose is 5/16". I will say this....there is a spark screen in the pulse nipple. One of my motors has them and the other does not. The motor I bought did not come with them. The motor I built, I put them in. I think it may keep the diaprahm from getting a little smokey!!!!LOL!!!

 

[jlds913]

Re: VRO to twin pumps

Thanks for all the great info. Pumps should be in today plan on getting this done later this week. I should have everything I need to do this job. I will feel so much better once I get that 12v pump off the boat. Do you guys think my motor should run better with the twin pump being there is no real way to regulate that 12v pump?

 

[emdsapmgr]

Re: VRO to twin pumps

I would not recommend doing a "T" on the pulse line. Follow Keefallan's recommendations. Only thing I'd do differently is to use the Bombardier plastic hose clamps instead of the tywraps. The tywraps can loosen up over time.

 

[jeffersondodson561]

Re: VRO to twin pumps

i bought multiple pumps from different sources, used whatever came with the pumps, just like your pulse line off your motor right now, still good. Note: use the pulse line for pulse, fuel line for fuel inspect the pulse line inside before cutting. View attachment 214147View attachment 214148. a little embarrased that i just used zip ties. you could fab a mount, i too lazy.

I am a little confused by your picture? You have the the inlet going to one pump and the outlet of that pump going to the inlet of the other pump. Being that 2 strokes induction manifolds are sealed from each other and the positive and negative pulses are generated by the piston movement and you are relying on two piston movements to create a proper steady volume of fuel. Why not T off the inlet from the fuel filter and have those two lines go to a fuel distribution manifold similar to yamaha's set up?

 

[jlds913]

Re: VRO to twin pumps

Ok everyone heres a little update. Got the pumps in yesterday so I went ahead and got them on. Both pumps bolt up right to the block and everything went right in place. Super easy install.My engine already had the correct fitting for the pulse like witch was right about the line that was used for the VRO? Just had a smalll rubber cap over it.Is this correct? I think this is the way to go if your having problems with a VRO. Not only is it a more simple set and takes up way less room you have the option for a rebuild if needed. Install took me about an hour after getting the fuel system primed back up. The engine fired up on the second turn of the key with a little choke. This engine has never sounded so good lol. Sounds much more crisp and smooth. I might have to do a little messing around with the linkage and idle adjustment, I plan on getting it out of the water this weekend, Any ideas on what to expect? Once again thanks to all of you for the great info.

 

[emdsapmgr]

Re: VRO to twin pumps

On a VRO V6 crossflow, there are two pulse holes drilled into the block. One of them has a brass hose barb which feeds the original VRO. The other is not used in this application, so the factory plugs it with a screw-in brass plug. You'll want to remove the plug and install a second brass hose barb just like the existing one. So-each pump will have it's own pulse port to the bock. If you have any questions, look at the factory parts list for a 1983 V6 dual pump installation.

 

[jlds913]

Re: VRO to twin pumps

So the other fitting i found directly above the pulse line that was used for the VRO ( and looks the exact same) is not the other pulse line?

 

[James R]

Re: VRO to twin pumps

A word to the wise. Never use teflon tape in fuel applications. It turns to goop and doesn't seal and in addition, if it gets into the fuel line, it blocks carbs very well. Use sealant made for fuel applications. Consult NAPA on this.

 

[emdsapmgr]

Re: VRO to twin pumps

Yes it is for the other pulse line.

 

[jlds913]

Re: VRO to twin pumps

yes??^^^

 

[jlds913]

Re: VRO to twin pumps

Ok everyone got the boat out this weekend (and got rained on) The boat ran flawless. When I got to the ramp primed it up with just 2 pump on the bubble, backed it into the water and it fired right up. I let it run for a few minutes to get everything warmed up and flowing. The boat jumps right up on plane and ran a GPS speed of 56.7mph. The engine does not bog,spit or sputter and idles great, Seems like it will do much better on fuel also. For anyone haveing problems with a vro this is the way to go. It feels so much better to have that 12v pump out of my boat and it set up like it should. This install is really easy to do yourself so anyone with prolems like mine feel free to ask me about it. Thanks to everyone that helped me out on this.

 

[pn]

Re: VRO to twin pumps

to answer jeffersons question a few posts back on my install of hoses... i couldn't tell you why but ... psi readings are at idle 2 and at speed its 5.