SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: GT Jets on July 09, 2008, 08:55:19 PM
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I was talking to my freind this morning and he has to replace the mechanical fuel pump on his houseboat this weekend.
He proceeded to tell me something shortly thereafter that made we want to smack him in the back of the head.
He told me the "marine" fuel pump was way to expensive for his 130hp 152" I4 "Iron Duke" (the little Chevy II) and that he was just going to buy a rebuilt Kragen special and go up there and put it on. I told him it had to be a "marine" approved pump with an SAE J117 sticker on it to be safe/legal because it has failure protection on it that literally kills the engine if it fails.
He then tells me the fuel pump costs $118.00, so I said "and", he then tells me he can get a Kragen special for $58.00, so I handed him $60.00 and said I'm buying your stupid life. He just smiled and handed my money back. He said he had to go order the "marine" pump.
In a closed engine compartment boat, do NOT ever cheat when it comes to USCG rated fuel/electical parts for the boat, this was a house boat that sleeps 12, think about that for a second...
A marine specific fuel pump (mechanical) has two diaphrams, one that pumps fuel into the bowl of the carb, and another heavier diaphram that floods the engine if the primary fails, killing the motor and ultimately the fuel flow. That is what that clear or yellow hose to the flame arrestor is for.
Sorry for the rant, but seemed relavent.
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I agree with you 100%. Even though my engine is exposed I have marine dizzy, ignition box, carb, alternator, starter and fuel pump. IT'S A BOAT!!! NOT A CAR!!! The few hundred bucks you'd save on automotive parts is not worth risking your life or the lives of others!!!
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I agree with you 100%. Even though my engine is exposed I have marine dizzy, ignition box, carb, alternator, starter and fuel pump. IT'S A BOAT!!! NOT A CAR!!! The few hundred bucks you'd save on automotive parts is not worth risking your life or the lives of others!!!
You should have bought a bilge blower too while you were at it .
-beerjet-
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if im not mistaken, the 152" motor is that 3.0L omc cobra 4cyl right?
Reid
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Mercruiser in this case, but yeah, this is the engine that came in the '60's Nova (Chevy II) Super common.
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if im not mistaken, the 152" motor is that 3.0L omc cobra 4cyl right?
Reid
That sounds like the 2.5L Mercruiser (used MANY of the same parts as the 3.0L)
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I was talking to my freind this morning and he has to replace the mechanical fuel pump on his houseboat this weekend.
He proceeded to tell me something shortly thereafter that made we want to smack him in the back of the head.
He told me the "marine" fuel pump was way to expensive for his 130hp 152" I4 "Iron Duke" (the little Chevy II) and that he was just going to buy a rebuilt Kragen special and go up there and put it on. I told him it had to be a "marine" approved pump with an SAE J117 sticker on it to be safe/legal because it has failure protection on it that literally kills the engine if it fails.
He then tells me the fuel pump costs $118.00, so I said "and", he then tells me he can get a Kragen special for $58.00, so I handed him $60.00 and said I'm buying your stupid life. He just smiled and handed my money back. He said he had to go order the "marine" pump.
In a closed engine compartment boat, do NOT ever cheat when it comes to USCG rated fuel/electical parts for the boat, this was a house boat that sleeps 12, think about that for a second...
A marine specific fuel pump (mechanical) has two diaphrams, one that pumps fuel into the bowl of the carb, and another heavier diaphram that floods the engine if the primary fails, killing the motor and ultimately the fuel flow. That is what that clear or yellow hose to the flame arrestor is for.
Sorry for the rant, but seemed relavent.
So did he run a uscg pump or not?
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You should have bought a bilge blower too while you were at it .
-beerjet-
;D >:D
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i totaly agree with you on that but its funny becouse my buddy owns a 2006 23 ultra stealth that he bought new from ultra it came with a 6al street version box and dist all msd non marine and has a holly Blue pump all from the factory and he has not had any probs on my boat i ran all street stuff becouse i had to they dont make enough high perf stuff in the marine side you cant get an elec fuel pump that flow 2500 gph or a spark hot enough to light the fire just my op :screwy:
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i totaly agree with you on that but its funny becouse my buddy owns a 2006 23 ultra stealth that he bought new from ultra it came with a 6al street version box and dist all msd non marine and has a holly Blue pump all from the factory and he has not had any probs on my boat i ran all street stuff becouse i had to they dont make enough high perf stuff in the marine side you cant get an elec fuel pump that flow 2500 gph or a spark hot enough to light the fire just my op :screwy:
You can get almost anything high performance in the marine version, just have to know where to look, MSD 6AL, Dominator carbs, High performance fuel pumps (Arizona Speed Marine), High torque starters, name it...The biggest problem is the "Marine you need this tax". ;D
That sounds like the 2.5L Mercruiser (used MANY of the same parts as the 3.0L)
Mercruiser made two 4 cyl models, the 2.5 and the 3.0 (120hp, 140hp) phisically the same with different internals.
Three models if you count the 470 ;460 Ford big block head, all aluminum block, integrated alternator, they're pretty cool, got a freind who put one in his rock crawler, damn thing makes like 410 ft.lbs. of torque at 1800rpm.
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My freind changed his fuel pump over the weekend and he used the "marine" version from Sierra, all went smooth, runs great, but while he was at the marina, one of the marina stewards stopped by just to shoot the shat and asked him what he was doing, when he told him changing the fuel pump, what do you think were the first words out of the stewards mouth? I love being right.... ;D
Needless to say, he's buying the beer next time. ;)
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I have a carter marine pump on my engine at it hst two ports. There is a larger one on the bottom to fill the fuel bows and another smaller one above it. I undertand that the top one is the saftey feature in case one of the diaphrams ruptures but where is teh best plac to mount it other end of the line? Does the line pump any air in normal operation or is there just fuel that will come out WHEN something happens that causes the pump to fail?
JoeI was talking to my freind this morning and he has to replace the mechanical fuel pump on his houseboat this weekend.
He proceeded to tell me something shortly thereafter that made we want to smack him in the back of the head.
He told me the "marine" fuel pump was way to expensive for his 130hp 152" I4 "Iron Duke" (the little Chevy II) and that he was just going to buy a rebuilt Kragen special and go up there and put it on. I told him it had to be a "marine" approved pump with an SAE J117 sticker on it to be safe/legal because it has failure protection on it that literally kills the engine if it fails.
He then tells me the fuel pump costs $118.00, so I said "and", he then tells me he can get a Kragen special for $58.00, so I handed him $60.00 and said I'm buying your stupid life. He just smiled and handed my money back. He said he had to go order the "marine" pump.
In a closed engine compartment boat, do NOT ever cheat when it comes to USCG rated fuel/electical parts for the boat, this was a house boat that sleeps 12, think about that for a second...
A marine specific fuel pump (mechanical) has two diaphrams, one that pumps fuel into the bowl of the carb, and another heavier diaphram that floods the engine if the primary fails, killing the motor and ultimately the fuel flow. That is what that clear or yellow hose to the flame arrestor is for.
Sorry for the rant, but seemed relavent.
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I have a carter marine pump on my engine at it hst two ports. There is a larger one on the bottom to fill the fuel bows and another smaller one above it. I undertand that the top one is the saftey feature in case one of the diaphrams ruptures but where is teh best plac to mount it other end of the line? Does the line pump any air in normal operation or is there just fuel that will come out WHEN something happens that causes the pump to fail?
Joe
Joe, first off exellent question, the small port on the pump will "pulse" air back and forth while the engine is running, really wont cause any issues with how the engine runs, the line should run up to the flame arrestor and into the throat of the carb, this will kill or flood the engine out to shut the boat down without spilling one drop of fuel in the bilge area, hopefully preventing a fire or other hazardous condition.
Hopefully this answers your question, BTW I always use clear tubing for that line to be able to see if there is any fuel in there, just make sure it's compatible with gas.
GT
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Taht is exactly what I am going to do. Now the next questions, the pump appears to be rebuildable but I have heard that you can no longer buy the rebuild kit. Does anyone know this to be true or not?
JoeJoe, first off exellent question, the small port on the pump will "pulse" air back and forth while the engine is running, really wont cause any issues with how the engine runs, the line should run up to the flame arrestor and into the throat of the carb, this will kill or flood the engine out to shut the boat down without spilling one drop of fuel in the bilge area, hopefully preventing a fire or other hazardous condition.
Hopefully this answers your question, BTW I always use clear tubing for that line to be able to see if there is any fuel in there, just make sure it's compatible with gas.
GT
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Taht is exactly what I am going to do. Now the next questions, the pump appears to be rebuildable but I have heard that you can no longer buy the rebuild kit. Does anyone know this to be true or not?
Joe
The problem is, from what I have heard is that Carter, Weber, and some other manufacturers have been "bought out" and there have been design changes, so rather than deal with the liability and hassle of selling a $20 part, they just stopped the practice...All hearsay and possible BS...
GT