1986 SeaOx 230c

wmconway

Seaman
Joined
May 10, 2010
Messages
65
I'm having a problem with the built-in 115 gal. fuel tank. It takes a lot of pumping to raise the gas and loses prime when i trailer the boat.

The tank sits about 2 feet below the fuel pump. There is a water sep filter on the transom at the same height as the fuel pump. The primer bulb is located between the water sep filter and the motor's fuel pump.

I've tried antisiphon valve on the pickup tube. The spring was too stiff and made it too hard to prime (primer bulb goes flat).

I also tried a checkvalve before the sep filter. This constricts fuel flow and didn't solve the problem.

Finally i put a LP gas shutoff valve in place of the checkvalve. even that doesn't prevent the leakdown. I then replaced the fuel line between the tank and the engine, thinking the line has a slow leak.

In order to get fuel to the motor, i have to take the fuel line off of the output side of the primer bulb, then prime the bulb until it squirts gas overboard, reconnect it and finish priming the motor. But once it starts up it runs fine.

I'm at my wit's end with this problem, any suggestions?
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,317
Re: 1986 SeaOx 230c

Sounds like a bad primer bulb (one way valve) and a partially clogged pick-up tube (anti-siphon spring too strong)?
 

wmconway

Seaman
Joined
May 10, 2010
Messages
65
Re: 1986 SeaOx 230c

I replaced the primer bulb and the new one works fine once you get the fuel up to it.

The built in tank was a mess when i got the boat. It had evaporated into sludge and took a lot of cleaning to get it all out. The pickup tube looks clean. I have run through several tanks to date.
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,317
Re: 1986 SeaOx 230c

The primer bulb has an anti-siphon in it to stop the flow of fuel from the motor back to the tank. Installed correctly, arrow pointing towards motor, you can not loose prime unless your bulb is bad or you have a leaking fuel hose between the tank and the primer bulb. Installed backwards, the anti-siphon valve would restrict the flow of fuel thru the bulb causing it to go flat.

A flat primer bulb is a restriction somewhere between the fuel tank and the primer bulb. A leaking hose can't cause a fuel restriction so you can rule out a leaking hose as the cause of the problem. This narrows it down to a defective anti-siphon valve or the primer bulb is installed backwards.
 

wmconway

Seaman
Joined
May 10, 2010
Messages
65
Re: 1986 SeaOx 230c

My primer bulb has 2 ball/cage check valves in it and the arrows point in the direction of the fuel flow - towards the engine.
 
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