Replaceing fuel lines and fuel system on a GT150 and a couple other questions?

[tfmech]

I have a 82 Hydrostream Vulture that I am putting a 89 GT150 on till I get done with the 2.6 XP for it. I am going to be running a electric fuel pump and deleting the VRO pump. When I do this is there anything else I can delete off the motor to unclutter I basically just want the ignition, choke, starting and charging system still working. I am going for speed, the boat is was already setup for a 200 Horse merc so it has all the go fast goodies on it, jackplate, trim on the wheel, good dual cable, hot foot, extra knees and a lot of aluminum bracing for the transom.

Second I am putting new lines on the carbs as they were all rotted question is what line do I need to use to replace the choke primer lines and the balance lines on the carbs, The stuff that is on it looks like vacuum line but I am guessing it is something special to handle fuel and oil? Can I use Tygon or Polyurethane?

Thanks for the help

 

[ondarvr]

Don't over think it, just get fuel line that fits. What do you expect to gain with an electric fuel pump?

 

[tfmech]

Well turns out small diameter reinforced fuel line for the choke primer system was easier to come by then I thought will be at the parts store in the morning.

 

[tfmech]

Don't over think it, just get fuel line that fits. What do you expect to gain with an electric fuel pump?

I am going to go with an electric to take the guess work out of it. I had problems more then once with the 140 V4 I had on my old bass boat put a kit in it twice then just bought a new one to finally stop having problems with it. Just think I will have less problems and take the guess work out of if it is working right or not and have smooth consistant fuel flow to the carbs.

I guess there is always the battery going dead thing. I figure if I crank on it enough that I kill the monster marine battery and the small backup I have it is probably not going to start by hand pulling it either and I will be on the tow rope anyway.

 

[ondarvr]

I think I've had one or two issues with a fuel pump in forty plus years, a quick rebuild and problem solved. If you've had repeated issues with stock fuel pumps there are other problems. Stock works fine, you're making it more complicated than it really is.

 

[emdsapmgr]

I'm with ondarvr on this. Your block is actually setup/drilled to accommodate the original fuel system from a 1983 V6 engine. This was the last of the factory engines that used the old dual fuel pumps. The next year (1984) was the VRO. Anyway, When most folks ditch the VRO, they revert back to the fuel system type on the 83. The pumps are very reliable, will pump at least enough fuel to power their 83-85 2.6 V6 engines which put out between 240 and 245 crank hp. And they are much cheaper and safer. Check the parts diagrams out on the factory website: epc.brp.com.

 

[tfmech]

I guess I might be giving the stock setup a bad rap maybe I was just unlucky with the 140. I have a two pump setup for my other 235 I can run but am I going to be able to trust the stock setup on the modified 2.6 that I putting together for it. I just want to put a fuel system together for it once and not have to find out that it is not enough for the 2.6 and have to put it on there later anyway. I should have the xp together here in a couple providing my schedule gives me the extra time. Just going to have the 150 on it to start off with. I guess that being said I was trying to figure out what prop I should start with on the 150 was thinking about a 22 pitch chopper or maybe a raker.....any thoughts?

This is not my first boat project it is just the first one that will have to have the setup pretty close to right. My others before were just grossly overpowered which made them fast with out the right setup and hand full to drive and unsafe to boot. This is just my first one with a hull designed for the HP I am going to throw at it.

Thanks for the help guys

 

[emdsapmgr]

I run an 83 2.6 with the old style dual pumps. No problem with fuel delivery. Just make sure the internal rubber parts are made to withstand today's ethanol fuels. (not old pumps with old internals.) You'll have a difficult time getting that big boat on plane with a 150 running a chopper. May work, but you'd be unhappy with it. I run a 27 SRX on my Hydrostream and it will only plane out with one or two people on board, and it takes a while to hook up. But it is a great prop. Agree, I'd think you might fine a 22 raker a good prop to start out with, check your wot rpm's, then adjust from there. 24 maybe just at tad too tall.

 

[tfmech]

Aright got kits for the stocker fuel pumps, Now for carb questions I got kits for the carbs on the 150 just to get them all part and notice the plastic fuel bowls are warped and have been leaking. Guessing this is a normal problem since the parts catalog has superseded them back to aluminum. I have two sets of 1 3/8 carbs from my 235s one set is a 81 and the other is a 85 haven't taken them apart to see if the bowls will work both sets have aluminum bowls. The ones on the 85 model look like they have one screw in the side for the main jet like the plastic ones anyone know if they will work before I go to the trouble of takeing them off?? The 81s have two jet orfices in the side.

Second since I have the two sets of 1 3/8 should I just put a set of them on instead of the stock 150 carbs?? Guessing they will make some more power. If so what jet sizes should I use in them as I figure the 235 jets might be a tad rich on the 150?

 

[ondarvr]

Get it running correctly on the stock carbs, then see if the others fit and work.

 

[tfmech]

Get it running correctly on the stock carbs, then see if the others fit and work.

Will do, know anything about if the bowls from the others will work as the stock plastic ones leak like a sieve?

 

[tfmech]

Well plastic bowls are flat again if the weather is nice going to fire it up tomorrow see what the old 150 runs like.

thanks for the help

 

[emdsapmgr]

Your long term goal will eventually want to replace the plastic bowls. They will eventually warp again and will cause you problems. If the bowls warp in a particular fashion, they actually can leak air into the upper carb, causing a lean condition. Be careful. The GT/XP carbs are actually from the older flatback 175 and the flatback 200's, so they will actually flow fuel/air pretty well. You can swap to the aluminum bowls if they match the configuration of the original 150 bowls.