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Started By
Message
Briggs Vanguard Mudboat Motor Issues
Posted on 12/15/14 at 4:01 pm
Posted on 12/15/14 at 4:01 pm
Looking for help in troubleshooting a problem with my go devil. Here's the back story....A boat mechanic installed a permanent tank in the front hull of the boat so we wouldn't have a portable tank in our feet. It has worked great for years. Here's the breakdown of the fuel setup.....there's a 14 foot fuel line down the right side of the boat from the tank to the back of the boat, then a primer bulb, then a small trickle fuel pump, then a water trap, then a line to the engine.
Lately, the motor won't start on a cool morning and i've tried the primer bulb but cant get the primer hard. Therefore i've walked the boat out to the blind. However, once it warms up during the day and the hunt is over, the motor cranks on the first try? I'm thinking that it's got to be a fuel issue and possibly air in the line, but i'm far from mechanically inclined and just going by a gut feeling.
Any help would be appreciated.
edit: inbeforegetahonda
Lately, the motor won't start on a cool morning and i've tried the primer bulb but cant get the primer hard. Therefore i've walked the boat out to the blind. However, once it warms up during the day and the hunt is over, the motor cranks on the first try? I'm thinking that it's got to be a fuel issue and possibly air in the line, but i'm far from mechanically inclined and just going by a gut feeling.
Any help would be appreciated.
edit: inbeforegetahonda
7
Posted on 12/15/14 at 4:07 pm to failuretocommunicate
Open the air vent on the tank.
Posted on 12/15/14 at 4:10 pm to eng08
quote:
Open the air vent on the tank.
this.
I've had similar issues with the line/bulb. may just be cracks that are exposing when the line contracts in the cold, but then when it warms up it expands back to seal the hole(s) in the bulb/line.
Try in this order:
open air vent
inspect/replace bulb/line
Posted on 12/15/14 at 4:11 pm to failuretocommunicate
Replace primer bulb.
Posted on 12/15/14 at 4:12 pm to tiger693
I had a homemade tank with a steel cap and no vent. I just drilled about an 1/8" hole in the side of the cap.
Posted on 12/15/14 at 4:12 pm to eng08
Tried that, to no avail.
This thing is pissing me off. I went friday in the middle of the afternoon and everything ran fine. Go back 12 hours later on Saturday morning and it's a 15 minute walk through the swamp if I want to hunt!
This thing is pissing me off. I went friday in the middle of the afternoon and everything ran fine. Go back 12 hours later on Saturday morning and it's a 15 minute walk through the swamp if I want to hunt!
Posted on 12/15/14 at 4:15 pm to tiger693
quote:
may just be cracks that are exposing when the line contracts in the cold, but then when it warms up it expands back to seal the hole(s) in the bulb/line.
As i mentioned, I'm not mechanically inclined, but i thought of this as well. Similar to a tire sensor coming on in my car only on cold days.
Posted on 12/15/14 at 4:17 pm to failuretocommunicate
I would swap the primer bulb and go from there. The check valves in those cheap POS can cause some funky issues.
This post was edited on 12/15/14 at 4:20 pm
Posted on 12/15/14 at 4:28 pm to TexasTiger01
I read on some message boards that the check valve/ball in some of these primer bulbs work better if the arrow is pointing up.....mine is pointing horizontally towards the engine and is on the floor of the boat....may try holding it upright to see if that makes a difference.
Posted on 12/15/14 at 4:29 pm to failuretocommunicate
quote:
I read on some message boards that the check valve/ball in some of these primer bulbs work better if the arrow is pointing up.....mine is pointing horizontally towards the engine and is on the floor of the boat....may try holding it upright to see if that makes a difference.
This is true. But that is also a sign of a worn/faulty bulb if you need to do that.
Posted on 12/15/14 at 5:29 pm to failuretocommunicate
Join Mudmotortalk.com if you haven't already and post your question. You'll get some BS responses, but you'll also get some with a legit diagnosis. A lot of those guys know these mud motors inside and out and do a lot of engine mods.
Posted on 12/15/14 at 6:39 pm to failuretocommunicate
How old is the engine? Carb overhaul if you have been running ethanol for the last five years.
Posted on 12/15/14 at 6:42 pm to TIGER2
The rubber tip on the needle valve is starting to get hard, next season it probably wont start warm either.
Posted on 12/15/14 at 6:52 pm to failuretocommunicate
Post your email if you're interested in a good affordable mechanic. He fixed mine for dirt cheap and would be happy to give him business.
Posted on 12/15/14 at 6:58 pm to failuretocommunicate
What size engine? I have a 35 vanguard with no primer bulb at all. I've had it for 4 years and never needed it. I have a brand new one in a dry box jic I ever do need one.
If I were you, I'd bypass everything by bringing a short hose and a FRESH can of gasoline. Just hook the new hose to the motor and stick it in the new gas and see what happens. This may help, but as previously said, it's possibly the needle valve or something with the carb. But at least testing it with a new line and gas would eliminate the fuel delivery system from the equation.
If I were you, I'd bypass everything by bringing a short hose and a FRESH can of gasoline. Just hook the new hose to the motor and stick it in the new gas and see what happens. This may help, but as previously said, it's possibly the needle valve or something with the carb. But at least testing it with a new line and gas would eliminate the fuel delivery system from the equation.
This post was edited on 12/15/14 at 7:00 pm
Posted on 12/15/14 at 8:03 pm to failuretocommunicate
Have you tried using the choke on cool/cold days? Only on cold days I have to choke mine.
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