Odd primer pump problem ...

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Just installed a 6 hp on a 12 footer at my son's cottage on the lake. What seems to me to be a very odd problem happened at the first test run. Motor would idle for a very long time ... but sometimes (yea not all the time) when I pushed it WOT it would go 50 feet and simply die.

When that happened the primer pump was soft and gas empty and priming it would push air only ... then after many tries it would prime again and the motor could be restarted.

I finaly found out that the primer pump would be operational only if positioned verticaly (upward) and would stop feeding gas when positioned horizontaly.

Ended up making a new shorter hose config so the primer pump would be closer to the motor gas intake connector thus standing verticaly ... ran hours that way without stalling.

I will put a new gas line hoses asap. Anyone familiar with this odd problem ? Or could it be an OB gas pump related problem ? Or gas line too long ?? Donno yet.

Tx
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,862
Re: Odd primer pump problem ...

check valve in primer bulb is bad
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Odd primer pump problem ...

By design, primer bulbs are most efficient when operated vertically. Most function ok horizontally but they should be oriented vertically or at least at a 45 degree angle. Air leaks and a bad bulb certainly possibilities.
 

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Re: Odd primer pump problem ...

check valve in primer bulb is bad

Most probably, Not taking any chance ... got complete new gas line/primer pump kit today ... will install tomorow ..

Tx
 

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Re: Odd primer pump problem ...

check valve in primer bulb is bad

Dead ON ... replaced the complete gas line kit ... the primer pump now remains filled with gas at all times no matter if it stand horisontal or vertical.

Tx
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,398
Re: Odd primer pump problem ...

Some of the aftermarket primer bulbs do not last long if horizontal.
 

pecheux

Lieutenant Junior Grade
Joined
Jun 9, 2006
Messages
1,200
Re: Odd primer pump problem ...

Some of the aftermarket primer bulbs do not last long if horizontal.

I did not know that, but someone else on this board also mentioned a prefered upward angle to the primer pump. The new gas line kit setup does just that which is a coincidence ... not my knowledge ... LOL

Tx for the advice, and have a great day.
 
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