Hello all, Trying to get my 2655 Bayliner out on the water! I am needing some help on the following ongoing issue.
I have a 350 mag mpi (serial number L325225). Engine has the cooled fuel pump. Symptoms; Intermittent starting issues. Engine cranks over but does not fire on cold start sometimes and especially when restarting engine is hot after running. Here is what I have checked;
1. Checked Fuel pressure on injector rail. Day before yesterday pressure was 30psi. Pressure held. Engine would not start until after repetitive attempts and wide open throttle in neutral started after about 5 minutes of cranking, resting and cranking again.
There is no warning alarms going off. I do not have a scan tool. Also, this problem has been going on for some time with marine mechanic at marina trying to fix with no success so not really wanting to bring them back for more $$$. I need to get this fixed once and for all. Only had the boat out once last year because of this issue.
2. Started boat yesterday. Started up right away. Had boat lifted out of water for bottom paint, and I did a stern drive oil change.
3. Boat back in water started right away. Ran back to dock slip. 1 hour later went to start - would not start after multiple cranks.
4. Checked Fuel pressure - 18 psi.
5. Checked spark from coil - spark present.
6. Checked fuel check valve from tank. seemed sticky. Cleaned it out and confirmed good action of the bearing close and open. Replaced. Still would not start.
Fuel pressure around 12 psi now.
7. Replaced fuel/ water separator with Quicksliver OEM.
7. Checked rubber fule line from tank to fuel / water separator assembly. Good flow present with no restrictions.
8. Plan to replace this rubber fuel line and check valve to rule them out but highly doubt this is the problem.
Not sure what to check next. Here is what I am considering but really would like some advice on what to do next.
Plan from here.
1. I plan to get an external fuel tank hooked up to the fuel line to rule out a tank supply problem. I am assuming that if it is a tank issue it would be a pickup screen clogged up or a tank vent issue? Assuming the supply from tank is not the problem...
2. Fuel Pressure Regulator. If the fuel pressure regulator was not working correctly - this could explain the fluctuation in pressures.
Note that I did check the vacuum line from the fuel pressure regulator. Can someone confirm that this vacuum line runs from the pressure regulator to the barb connector on the throttle body?
3. Fuel pump. The fuel pump might not be working but it would have to be intermittent and working one minute and then putting out a lower pressure the next.
While this is possible it does not seem too likely to me?
4 Fule pressor sensor. I understand there is a sensor for fuel pressure but I am not sure where it is located or how to test. Also I understand there are two types
One for 30 psi and one for 43 psi. Can anyone tell me based on my serial number - which should I have?
The final question I have - why does the boat not fire - even with 18 psi? Should it not still fire and idle? Am I having 2 problems here? Or is 18 psi or 12psi not enough pressure to fire up?
I can check each plug for spark, pull and examine each plug (these were replaced last year and boat ran once) and start looking at ignition issues, distributor (which I believe the mechanic replaced). But I need to get the fuel issue figured out.
Puzzling why it finally fired after lots of cranking and open throttle. To me it seemed like it was simply not getting fuel to start.
I would appreciate any advice on what to do next. I don't want to start to throw parts at this like fuel pumps, regulators without some evidence that I am heading in the right direction.
Much appreciate any help.
I have a 350 mag mpi (serial number L325225). Engine has the cooled fuel pump. Symptoms; Intermittent starting issues. Engine cranks over but does not fire on cold start sometimes and especially when restarting engine is hot after running. Here is what I have checked;
1. Checked Fuel pressure on injector rail. Day before yesterday pressure was 30psi. Pressure held. Engine would not start until after repetitive attempts and wide open throttle in neutral started after about 5 minutes of cranking, resting and cranking again.
There is no warning alarms going off. I do not have a scan tool. Also, this problem has been going on for some time with marine mechanic at marina trying to fix with no success so not really wanting to bring them back for more $$$. I need to get this fixed once and for all. Only had the boat out once last year because of this issue.
2. Started boat yesterday. Started up right away. Had boat lifted out of water for bottom paint, and I did a stern drive oil change.
3. Boat back in water started right away. Ran back to dock slip. 1 hour later went to start - would not start after multiple cranks.
4. Checked Fuel pressure - 18 psi.
5. Checked spark from coil - spark present.
6. Checked fuel check valve from tank. seemed sticky. Cleaned it out and confirmed good action of the bearing close and open. Replaced. Still would not start.
Fuel pressure around 12 psi now.
7. Replaced fuel/ water separator with Quicksliver OEM.
7. Checked rubber fule line from tank to fuel / water separator assembly. Good flow present with no restrictions.
8. Plan to replace this rubber fuel line and check valve to rule them out but highly doubt this is the problem.
Not sure what to check next. Here is what I am considering but really would like some advice on what to do next.
Plan from here.
1. I plan to get an external fuel tank hooked up to the fuel line to rule out a tank supply problem. I am assuming that if it is a tank issue it would be a pickup screen clogged up or a tank vent issue? Assuming the supply from tank is not the problem...
2. Fuel Pressure Regulator. If the fuel pressure regulator was not working correctly - this could explain the fluctuation in pressures.
Note that I did check the vacuum line from the fuel pressure regulator. Can someone confirm that this vacuum line runs from the pressure regulator to the barb connector on the throttle body?
3. Fuel pump. The fuel pump might not be working but it would have to be intermittent and working one minute and then putting out a lower pressure the next.
While this is possible it does not seem too likely to me?
4 Fule pressor sensor. I understand there is a sensor for fuel pressure but I am not sure where it is located or how to test. Also I understand there are two types
One for 30 psi and one for 43 psi. Can anyone tell me based on my serial number - which should I have?
The final question I have - why does the boat not fire - even with 18 psi? Should it not still fire and idle? Am I having 2 problems here? Or is 18 psi or 12psi not enough pressure to fire up?
I can check each plug for spark, pull and examine each plug (these were replaced last year and boat ran once) and start looking at ignition issues, distributor (which I believe the mechanic replaced). But I need to get the fuel issue figured out.
Puzzling why it finally fired after lots of cranking and open throttle. To me it seemed like it was simply not getting fuel to start.
I would appreciate any advice on what to do next. I don't want to start to throw parts at this like fuel pumps, regulators without some evidence that I am heading in the right direction.
Much appreciate any help.