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TOPIC: Carb leaking fuel!

Carb leaking fuel! 03 Sep 2017 15:17 #1

  • CptCrunchie
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Went halibut fishing across the line yesterday. I anchored in 120' of water. Shortly after bringing in a nice 37lb'er, the winds started picking up and we decided to head home. While running the windlass, I raised the RPM slightly to give it a little more power. Once the anchor was back resting in its pulpit, I put it in forward and swung the boat toward home.

Monitoring the fuel consumption, everything appeared normal. It started at 24GPH as we rose in speed. At 20kts for about 30 seconds, however, I saw that the fuel consumption had only dropped to 18GPH. I slowed the boat to 15kts, and the fuel consumption lowered to 15GPH. It stayed like this for about a minute, but noticed that the engine was .....lugging. I dropped it out of gear and the engine died.

Opening up the engine compartment, I could smell gas, but I couldn't see any. But when I turned the engine over, I could see gas leaking out of the carb onto the manifold. In fact, a pool of gas quickly gathered in the area I've indicated.



Anyone know what would cause this? Is it a stuck float? If so, does that mean I need to have the carb rebuilt?

JSYK, I only use non-ethanol premium gas, and always add the correct amount of Stabilizer with each fill. (We also came back on the kicker. 3.5 hours @ 3-4kts, I'm glad the 15-20MPH headwinds didn't show up as predicted.)

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
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Carb leaking fuel! 03 Sep 2017 15:33 #2

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I'd think a float issue would cause flooding but you probably wouldn't see any pooling of fuel in the area you've indicated as the vent for the float bowl in under the flame arrestor. Maybe the throttle shaft has worn it's bore?
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Carb leaking fuel! 03 Sep 2017 17:09 #3

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throttle shaft hole
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Carb leaking fuel! 03 Sep 2017 17:11 #4

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Sounds to me like it's the throttle shaft leaking. If that is the case don't run it until fixed. It would be dieing at idle because the leaking throttle shaft is probably creating a vacuum leak.

Heck with all that though I want to see the pic of the 37 pounder or none of this happened. :)
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Carb leaking fuel! 03 Sep 2017 17:29 #5

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yachtman wrote: Sounds to me like it's the throttle shaft leaking. If that is the case don't run it until fixed. It would be dieing at idle because the leaking throttle shaft is probably creating a vacuum leak.

Heck with all that though I want to see the pic of the 37 pounder or none of this happened. :)


As you wish. It's 43" ...or in Canadian,109cm.

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
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Carb leaking fuel! 03 Sep 2017 17:36 #6

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The throttle shaft. It ran like stink before we dropped anchor - 9.5GPH @ 20kts from Port Angeles Haven to the Canadian side of Coyote Bank. Fired up right away when I pulled the anchor. Then suddenly, the fuel consumption went crazy. If you are saying it is wear, wouldn't the fuel consumption have dropped gradually, or is there a sleeve - or something - that fell out or broke apart?

From what you guys are saying, it looks my it's time let my OMC guy deal with it. Anyone know what this would cost ...roughly?

Thanks everyone.

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
Kevin

Carb leaking fuel! 03 Sep 2017 18:10 #7

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Mine did the same thing about 7/8 years ago and my mechanic rebuilt it for about 160 or so...yours looks like a Quadrajet like mine...
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Carb leaking fuel! 03 Sep 2017 18:30 #8

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great chance to replace it with an Edelbrock 1406 marine...
although it will require a few minor arrangements, well worth it IMO.
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Carb leaking fuel! 03 Sep 2017 18:42 #9

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Ruffryder wrote: great chance to replace it with an Edelbrock 1406 marine...
although it will require a few minor arrangements, well worth it IMO.


+1 I did that and never regretted it. Economy and performance both increased.
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1989 Avanti 3450 Sunbridge twin 454's

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Carb leaking fuel! 03 Sep 2017 19:20 #10

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Ruffryder wrote: great chance to replace it with an Edelbrock 1406 marine...
although it will require a few minor arrangements, well worth it IMO.


I believe that's the same carb I put on my Chris Craft with the twin 327's.

You say they are more fuel efficient, but what makes them so?

From what I was told back then, the choke has to be changed to electronic. However, they already did that when they replaced the 5.0L with a 5.7L.

I see them on eBay for $229. Hmmmm....... Remanufactured or buy new?

www.ebay.com/itm/like/272771152592?chn=ps&dispItem=1

Does it make any other difference with mine being a Vortec?

In round figures, how much to just have them switched out?

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
Kevin
Last Edit: by CptCrunchie.

Carb leaking fuel! 03 Sep 2017 20:05 #11

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5hat carb # should be a 1409. Not 1406. The cost of a factory rebuilt would be around $350-400 and a factory new is $450-500.
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1989 Avanti 3450 Sunbridge twin 454's

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1979 Bayliner Conquest 3150 hardtop hull#24
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Carb leaking fuel! 03 Sep 2017 21:20 #12

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Whoops, 1409 is correct!
Kevin, your existing Rochester is spread bore carb, Edelbrock being a square bore carb, will need a new intake or an adapter plate, linkage, fuel line will require minor adjustments.
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Carb leaking fuel! 03 Sep 2017 21:29 #13

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Ruffryder wrote: Whoops, 1409 is correct!
Kevin, your existing Rochester is spread bore carb, Edelbrock being a square bore carb, will need a new intake or an adapter plate, linkage, fuel line will require minor adjustments.


Ah. Okay. Thought I could remove and replace it myself, then let my mechanic set it when he does the tune-up.

Thanks for the info.

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
Kevin
Last Edit: by CptCrunchie.

Carb leaking fuel! 03 Sep 2017 21:46 #14

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Be very, very careful with what adapter plate is chosen.

You go with the 1409 then get a Edelbrock intake.
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Carb leaking fuel! 03 Sep 2017 21:51 #15

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Ruffryder wrote: Whoops, 1409 is correct!
Kevin, your existing Rochester is spread bore carb, Edelbrock being a square bore carb, will need a new intake or an adapter plate, linkage, fuel line will require minor adjustments.


Is this the adapter plate I need?

www.summitracing.com/parts/edl-2696

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
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HAM: KE7TTR
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Carb leaking fuel! 03 Sep 2017 21:54 #16

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Yes
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Carb leaking fuel! 03 Sep 2017 22:05 #17

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Ruffryder wrote: Yes


Barring issues with my 5 thumbs when doing mechanics, as long as I can get everything to connect, as in extending the fuel line, and adjusting the linkage, I should be able to make the swap?

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
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HAM: KE7TTR
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Carb leaking fuel! 03 Sep 2017 22:05 #18

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I wouldn't keep the quad unless you can rebuild the one you have.
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Carb leaking fuel! 03 Sep 2017 22:11 #19

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Chief Alen wrote: I wouldn't keep the quad unless you can rebuild the one you have.


It already has a Vortec manifold. So it's basically a $20 adapter versus a $230 manifold replacement? Is there really that much difference?

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
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Carb leaking fuel! 03 Sep 2017 22:51 #20

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The other option is a marine Holley 4bbl. OMC used these carbs after they stopped using QJets (1990 or 1991) so it should fit the intake without an adaptor and might need less adaption than the Edelbrock 1409. The Holley might cost more though. Why not try getting the QJet rebuilt and see how that goes?
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Carb leaking fuel! 03 Sep 2017 23:01 #21

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I used the adaptor and have had no problems. I had to have a new fuel line made and wire electric choke. Took very little work.
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Carb leaking fuel! 04 Sep 2017 00:31 #22

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Adding a ¾" spacer to the height of the carb brings up a very interesting point regarding the 1" sound deadener under the cowl. Is there a minimum space I should have between it and the backfire flame arrestor? I'm going to the boat in a little bit with a big piece of aluminum foil. I'm going to make a very loose ball with it and put it on top of the current flame arrestor, closet lid, then see how much space there is now.

I'll let you know what I find.

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
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HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
Kevin
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Carb leaking fuel! 04 Sep 2017 23:20 #23

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Okay! That was ....fruitful!

I can use the existing flame arrestor, because the flange is 5.125", which is the size the 1409 takes.

I also have roughly 4" between the sound deadener and the top of the arrestor, so adding a .8" adapter should still leave lots of space between them.

I looked at the various connections. I can see how I may need to replace the fuel line. However, I forgot to see if the line is copper or stainless steel, and whether the ends are flared with nuts, or soldered fittings. Which might they be?

If they are flared, I have a ⅜" tube bender, a flaring tool, and about 30' of ⅜" copper tubing, so it shouldn't be much of a challenge.

Thanks guys, for all your sagacious wisdom, and your willingness to share it.

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
Kevin
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Carb leaking fuel! 05 Sep 2017 06:33 #24

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One thing to check:
The Edelbrock appears wider than the QJet and I wonder if it will clear the bracket for the shift linkage on the starboard side of the engine. The fuel line also comes in right on that side while on the QJet it's in front behind the Thermo housing.

I know that when Michigan Motors sells the 4.3 Vortec V6 partial engines they say OMC apps must use the Holley 4 bbl; while Merc can use the Edelbrock. It might be different on the V8 but it's worth a call to check first if you're thinking of getting the Edekbrock....
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Carb leaking fuel! 05 Sep 2017 09:57 #25

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On a Q jet the fuel comes in at the front of the carb facing the front of the engine. The edelbrock fuel hose will enter the carb at the left side toward the back of the carb. So the first thing is the old line is.too short but it also is.in the wrong position on the engine. Ill try to get a pic. The connection
flange to the carb is also different from the Q jet to the edelbrock

The throttle linkage was a complete non issue everyhing bolted right up and I adjusted the linkage however mine was a marine power engine your experience.may vary.
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1989 Avanti 3450 Sunbridge twin 454's

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Twin chevy 350's
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