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Fuel primer bulb loss of pressure after 5 mins...
#10724376
03/26/15 02:18 AM
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Joined: Mar 2008
Posts: 2,628
brandon f.
OP
Extreme Angler
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OP
Extreme Angler
Joined: Mar 2008
Posts: 2,628 |
Any ideas why my primer bulb looses pressure after about 5 mins?
A month ago I bought a "new to me" boat, first thing I did after test ride was pull the fuel tank and clean it out as it was full of crud. (see link below)
http://texasfishingforum.com/forums/ubbthreads.php/topics/10631757/Re:_Cleaning_Fuel_Tank#Post10631757
After installing the tank back into the boat I put 25 gallons of fuel in the 49 gal tank. I checked all of the hose clamp fittings and they are all tight. I replaced the inline filter/ water separator as well and it seems to be sealed tight.
I go out to the lake and prime the bulb until its firm and run around for a while and it runs great. If I stop to fish for 5 or more mins the bulb is flat again and I have to prime it back up.
Any ideas? I don't know if this was happening prior to purchasing the boat or not so ill consider checking anything that might be related.
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10724489
03/26/15 02:47 AM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
It is most likely the bulb. I have gotten bad brand new ones before. A very small leak will do this also.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10725182
03/26/15 01:44 PM
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Joined: Jan 2013
Posts: 1,236
Chemdawg
Extreme Angler
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Extreme Angler
Joined: Jan 2013
Posts: 1,236 |
I was going to say the same thing bad bulb or your one of your horse has a small leak in it but i would replace the bulb first
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10725356
03/26/15 02:34 PM
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Joined: Aug 2003
Posts: 683
phototom
Pro Angler
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Pro Angler
Joined: Aug 2003
Posts: 683 |
I carry a spare bulb with me as I have had this happen while on the water easy to replace even on the water,but best if you can get to shore boat will be stable.
1991 Tracker TX17 40HP evinrude Eagle 320 console Eagle 320 bow Garmin 72 GPS [Signature images may not be larger than 600 pixels wide by 125 pixels tall.]
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10725454
03/26/15 03:03 PM
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Joined: Jul 2002
Posts: 61
Mark L
Outdoorsman
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Outdoorsman
Joined: Jul 2002
Posts: 61 |
Had this happen. It was a small air leak at the bulb
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10725858
03/26/15 05:15 PM
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Joined: Jul 2010
Posts: 13,029
GarySHO
Ice Ice Baby
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Ice Ice Baby
Joined: Jul 2010
Posts: 13,029 |
If not the bulb, your low pressure fuel pumps on your engine may have a hole in the diaphram. Check the inside of your prop and see if it is sooted up.
A vote is like a rifle; its usefulness depends upon the character of the user- Theodore Roosevelt Broken Bow Lake Fishing Guide 2020 Caymas CX 20 PRO and 250 SHO
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10725973
03/26/15 06:09 PM
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Joined: Jun 2011
Posts: 219
Fastest115GP100
Outdoorsman
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Outdoorsman
Joined: Jun 2011
Posts: 219 |
If you replace the bulb, be sure to use a quality one (from Merc or Yamaha, etc)
The Ruger GP100 is KING
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10727372
03/27/15 04:22 AM
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Joined: Oct 2005
Posts: 1,711
Lou r Pitcher
Extreme Angler
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Extreme Angler
Joined: Oct 2005
Posts: 1,711 |
The bulb when pumped lifts the fuel from the tank and temporarily pressurizes it forcing fuel and any air in the lines into the motor and its vapor sep tank and fuel lines.
Once the motor is run, the motor's fuel pump creates vacuum (lift) in the boats fuel lines to draw fuel up and into the motor...there is no longer any pressure in the bulb nor should there be after the motor is ran.
The bulb should remain reasonably full of fuel, but it will not be at pressure. The motors lift pump should be able to continue to draw fuel from the boat later in the day without further priming as the bulb should be remain reasonably full. If not you have air leaking/entering the fuel line or pump.
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10729942
03/28/15 03:37 PM
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Joined: Aug 2011
Posts: 2,957
Bob Landry
Extreme Angler
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Extreme Angler
Joined: Aug 2011
Posts: 2,957 |
The OP said the bulb goes flat. That has to be a blockage in the fuel line between the tank and the bulb. I had the same problem with my new SeaArk. The fuel tank wasn't blocked on one end and it shifted over and pinched off the fuel hose.
2015 Seaark 1872 MV CC Etec-90 Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic 2020 Robalo R200 CC, Yamaha 150
Bitter Gun Owner Bitter Clinger Armed Infidel
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: Lou r Pitcher]
#10730135
03/28/15 07:18 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
The bulb when pumped lifts the fuel from the tank and temporarily pressurizes it forcing fuel and any air in the lines into the motor and its vapor sep tank and fuel lines.
Once the motor is run, the motor's fuel pump creates vacuum (lift) in the boats fuel lines to draw fuel up and into the motor...there is no longer any pressure in the bulb nor should there be after the motor is ran.
The bulb should remain reasonably full of fuel, but it will not be at pressure. The motors lift pump should be able to continue to draw fuel from the boat later in the day without further priming as the bulb should be remain reasonably full. If not you have air leaking/entering the fuel line or pump. ? Kill your motor wait 5 minuets, unhook the motor side of the bulb and see what happens. You will get fuel sprayed on you from the pressure.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Fuel primer bulb loss of pressure after 5 mins...
[Re: brandon f.]
#10730710
03/29/15 02:09 AM
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Joined: Mar 2008
Posts: 2,628
brandon f.
OP
Extreme Angler
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OP
Extreme Angler
Joined: Mar 2008
Posts: 2,628 |
Replaced the bulb last night. Went out today. It ran good, bulb never went flat. Only primed it when I launched and never had to re-prim.
Thanks guys.
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