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ContinuousWave: Whaler Repairs/Mods
Gas Line problem
|Author||Topic: Gas Line problem|
posted 06-27-2001 07:05 PM ET (US)
Took the Montauk out tonite after replacing the tank with a 28 gal. Tempo. Started and idled ok at the dock. Once underway, started to run a bit rough and quit. Got it going again, gave it some throttle, jumped up to 3500 and quit.
The bulb was a bit slack. Pumped it up, started ok, then same result.The bulb would not stay fully primed. It almost seems like there is an air pocket in it or something.
I put 15 gallons in the tank before we left( it was bone dry). No apparent kinks in the line, and I used the same fitting that was on the old tank.
The buld stayed hard at home on the hose.
Any ideas? Might it be the fitting? The engine(70 yam) has run perfect prior to this tank swap.
Thanks in advance for your help.
|Tom W Clark||
posted 06-27-2001 07:09 PM ET (US)
The first thing that comes to mind (and I'm not familiar with the 28 gallon Tempo tank) is the tank vent. Was it open? Is this a self venting tank? Could the vent be fouled? You could test it by just cracking the fuel fill cap enought to let the tank pressure equalize with the atmosphere.
If this is not the problem then start looking for obstructions.
posted 06-27-2001 08:09 PM ET (US)
I have the same tank in my Montauk and it is not self venting. Make sure the vent, in the center of the cap, is open.
posted 06-27-2001 08:23 PM ET (US)
Sometimes the check ball becomes out of round and won`t seat. This is due to changes (re:alchohols) in the gas. It`s a cheap fix if thats what it is. Get an O.M.C. primer bulb. I`ve had the best luck with those. Steve.
posted 06-27-2001 08:48 PM ET (US)
Thanks, guys. I did check for venting and the vent was open. I will probably buy a new fitting and bulb just in case. I am going boat camping on a lake Friday and will not have a chance to try it again before that. I'm not too worried about breaking down on the lake or doing on the water tinkering there. ( you Great Lakes whalers...thats another story, eh?)
Any other ideas are welcome!
posted 06-27-2001 09:36 PM ET (US)
I'd suspect it's sucking air the QD fitting at the tank.
Your symptoms sound a lot like a problem
I had. BTW, on your trip, I'd take a some
extra hose. In a pinch, you can shove the
hose down the filler. You gotta be careful
not to slosh gas out and go BOOM though.
posted 07-03-2001 02:58 PM ET (US)
Just had a similar problem on Sunday with my Montauk and 28 gal Tempo Tank and fuel bulb. It intermittantly got up to speed, and then just died out.
Since it seemed to be a fuel delivery problem, I pulled the fuel filter to see if perhaps I got a bunch of crap in the last tank of gas.
When pumping the bulb to make the fuel flow, it pumped fuel several times and then shut down completely. With the collapsed bulb in hand, I felt a lump inside of the bulb.
When I took the bulb apart, the check valve for the outlet of the bulb was rattling around loose inside of the bulb. The ball portion was able to get into the outlet line and completely block it.
The check valve was snapped back into place and the bulb reassembled and put back in the line. I expect that I (or the service guy) had stepped on the bulb and popped the check valve out of its housing.
I'll test run it tomorrow and verify that it is in fact fixed.
posted 07-03-2001 06:05 PM ET (US)
An update.... I wasnt able to get the fitting as the local store was out. I ventured to the lake anyway..same problem. It idled and ran at headway speed fine, then quit at higher rpm. After giving the bulb a squeeze or two, it ran fine. It did this several times.The check valve on the female end seems ok. I replaced the fitting at the tank yesterday, and used some pipe dope to seal it for good measure. We'll see whats next!
On a positive note, the engine ran great when it got enough gas. Could the fuel pump be going? Would it run so good if this was the case? The engine (70 Yam, 96) probably has 200-300 hrs. on it at most.
I'll let you know how I make out......
posted 07-05-2001 11:18 AM ET (US)
Sounds like a primer bulb to me. Do yourself a favor and replace all your fuel line (from tanks to motor) instead of just chaning out the bulb. When my primer bulb went bad, I discovered a section of fuel line inside the tunnel that was chaffed and would have eventually leaked. Also, check the little fuel filter screen on your motor. If your old tanks had rust and dirt in them, there may be some gunk on it, restricting fuel flow to the carb.
BTW, when I got my Montauk, I immediately bought a complete spare fuel line set-up. My exereience has been that most on-water motor problems are fuel related, and a spare would allow me to bypass my inline filter, primer bulb, etc. and run off a spare 6 gal. tank if I had problems. Incedentally, my primer bulb went bad about 4 miles off shore in the Pacific in 6 foot swells. The spare line not only got us home safely, but we didn't even miss out on the day's fishing.
posted 07-27-2001 09:46 PM ET (US)
I brought this thread up again to report my final results. The brand new tank was defective; apparently it did not vent properly. In fact, it split! The vent was fully open!
I reinstalled my old tank, and the motor runs perfect.I like the idea of the capacity of the Tempo c2814, but now I am a wee bit gun-shy. I'll stick with the 19 gal. Tempo for the rest of this season. I did end up replacing the fittings, and the bulb. If the tank hadn't split, who knows? I may have ended up with a new fuel pump....All's well that ends well, eh?
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