1995 sundancer 370 fuel question

D

DaltonGang

Member
Aug 11, 2020
104
Boat Info
1995 SeaRay 370 Sundancer
Engines
8.1 Horizons
I am chasing a fuel issue (I think) and with new fuel pumps in the cool fuel module, they are running at key On, still no fuel. I probably need to prime the line and I will check the water sep/filter for water but now I'm questioning the anti siphon valve. I believe mine is connected to the elbow at the top of the tank.

it just looks like a hose barb fitting. See the attached photo.

Long story short, my 8.1 engine died while coming in. Runs for a minute and dies. Fuel pressure was ok but loses it after 30 seconds. Seems like a restriction at this point. The longer it sits, the longer it will run up to a point. Longest being maybe 2 minutes.

The test I'm going to do is use a 2 gallon gas can, fuel line with primer bulb and connect straight to cool fuel module. See if engine runs fine off gas can. If so, then I know its something between tank and module. Bad idea???

IF it runs, The possibilities I suppose would be
1) anti siphon valve
2) water in filter
3)restriction at fuel flow meter

If it doesn't run, I have a list of things to check (relays, sensors, TPS, etc)

ss5.png
 
DaltonGang said:
I am chasing a fuel issue (I think) and with new fuel pumps in the cool fuel module, they are running at key On, still no fuel. I probably need to prime the line and I will check the water sep/filter for water but now I'm questioning the anti siphon valve. I believe mine is connected to the elbow at the top of the tank.

it just looks like a hose barb fitting. See the attached photo.

Long story short, my 8.1 engine died while coming in. Runs for a minute and dies. Fuel pressure was ok but loses it after 30 seconds. Seems like a restriction at this point. The longer it sits, the longer it will run up to a point. Longest being maybe 2 minutes.

The test I'm going to do is use a 2 gallon gas can, fuel line with primer bulb and connect straight to cool fuel module. See if engine runs fine off gas can. If so, then I know its something between tank and module. Bad idea???

IF it runs, The possibilities I suppose would be
1) anti siphon valve
2) water in filter
3)restriction at fuel flow meter

If it doesn't run, I have a list of things to check (relays, sensors, TPS, etc)

ss5.png
Click to expand...
In my 1998 370DA the anti siphon valves are at the other end of these fuel lines, i.e. at the remote fuel filters located on the forward engine room bulkhead. I don't have any pics and boat is put away so i can't "point" them out to you. It is a brass construction ball check valve. Pretty easy to pull apart and check.
 
jgoedd99 said:
In my 1998 370DA the anti siphon valves are at the other end of these fuel lines, i.e. at the remote fuel filters located on the forward engine room bulkhead. I don't have any pics and boat is put away so i can't "point" them out to you. It is a brass construction ball check valve. Pretty easy to pull apart and check.
Click to expand...

Ok I don't remember seeing anything there. I see the flow meter on the bulk head (which could be an issue too) but I'll have to follow the fuel line all around and see if I can locate it.
 
There are no mechanical anti-siphon valves on this setup. They are electrical fuel shutoff valves, that are Parker Skinner in origin. Their purpose is to shut off fuel flow when the ignition is turned off (or perhaps when the high pressure fuel pump loses power, depending on how it is wired), and to allow fuel to flow when the engine is running. I have had the solenoids overheat and stick. There is a manual bypass knob on the side of the valve to allow you to allow fuel flow full time. If you search for fuel shutoff valves, or Parker Skinner on this site you will find pictures, locations, and operation of the bypass knob.
 
370Dancer said:
There are no mechanical anti-siphon valves on this setup. They are electrical fuel shutoff valves, that are Parker Skinner in origin. Their purpose is to shut off fuel flow when the ignition is turned off (or perhaps when the high pressure fuel pump loses power, depending on how it is wired), and to allow fuel to flow when the engine is running. I have had the solenoids overheat and stick. There is a manual bypass knob on the side of the valve to allow you to allow fuel flow full time. If you search for fuel shutoff valves, or Parker Skinner on this site you will find pictures, locations, and operation of the bypass knob.
Click to expand...


Ok thanks. I’ve never noticed them but haven’t really looked specifically. I’m going to try and run engine from a gas can first. If it’s fine then I’m going to use a primer bulb (with key on) and see if in can get flow from fuel system before fuel cooler.

before doing this I’m going to change the water separator filter and check for water. I think at some point doing these tests I’ll find the problem.
 
DaltonGang said:
Ok I don't remember seeing anything there. I see the flow meter on the bulk head (which could be an issue too) but I'll have to follow the fuel line all around and see if I can locate it.
Click to expand...
I'm curious about what you are calling a flow meter. Do you mean a sender for a flow monitor like a flowscan, or an actual inline meter? Pics would help.
 
DaltonGang said:
I have a GPH fuel burn gauge and this “meter” is on the bulkhead with fuel going through it. One for each engine.

looks like this
https://baspartsales.com/201-mooney...oifs7L9QDMXUIDFzH4RgIgXJ5exwyRMhoCpZwQAvD_BwE
Click to expand...
Got it. So, if that transducer got clogged up with bits of old fuel line, varnish, etc. it could certainly be acting just like the shutoff valve. Unless the hose is too tight, easy enough to get a double barb fitting, and bypass it. However, if you were getting no fuel through, you would not run for 2 minutes or have pressure. Might be a good idea to spin that separator, and check to see if it's way low, or dry even.
 
You must log in or register to reply here.

Forum statistics

Threads
113,124
Messages
1,426,655
Members
61,037
Latest member
wojozobl
Back
Top