I could really use some help on figuring out why my 200HP OX66 won't start. Sorry this is so long but I wanted to describe everything I've done and how the starting problem has changed. The engine hasn't been in the water this year because I got a late start and then ran into these starting problems. It was winterized.
Initially, the engine would crank and start, run really rough, not much power, start to stall then seem to recover a little then start to stall. It would repeat that for maybe half a minute and then stall completely. It acted like it was not getting a steady supply of fuel or water was in the fuel. I eliminated a water problem by changing the onboard filter, the water/fuel separator (no water in it), and trying to run it using a gas can with fresh fuel. No change in starting behavior. I also replaced all the spark plugs that needed to be done anyway.
The LP fuel pumps had not been changed for 4-5 years so I replaced both pumps with new pumps and gaskets. There was no change in starting behavior, but I noticed that when I squeezed the primer bulb, the upper, new LP pump was leaking from the front seal, not from the back where it attaches to the engine. I pulled the pump and replaced with another new one.
When I replaced the pumps the first time, for easier access, I unbolted the oil tank and VST and moved them aside for easier access. I also disconnected some harness connectors to get wires out of the way.
As I said, the first time I replaced the pumps and put everything back together the engine cranked and started but still stalled after a short time. Now, after replacing the leaking upper LP pump and putting everything back together, the engine cranks but does not turn over at all. The only difference between pump replacements is that when I did the second upper LP pump replacement, when I unbolted the oil tank and let it hang down, some oil leaked out of the top tube on the tank that connects to the intake cover (it was not connected).
The bulb is firm, I don't smell any leaking gas, I can't find any connectors that I failed to reconnect, there is fuel in the VST tank.
I've got lots of questions on what the next debugging steps should be and what to check first.
- If there was an electrical connector that I forgot to reconnect, would the engine even crank?
- If I disconnected the fuel hose on the VST tank that comes from the LP pump , and cranked the engine, would seeing fuel being pumped verify the LP pumps were working and fuel was making it to the VST, or does the VST hose need to be connected for the LP pumps to work?
- I'm assuming the high pressure pump isn't a problem since the engine did start when I began all these repairs. Are there any connectors on the VST tank that could have come undone when I unbolted it and moved aside? I'm planning on unbolting it again so I take a good look. Anything else I should check?
I'll do a google search on how to test to see if the high pressure pump is getting power.
Any ideas on what else to look for and in what order to for possible problems?
Thanks for any help.
Initially, the engine would crank and start, run really rough, not much power, start to stall then seem to recover a little then start to stall. It would repeat that for maybe half a minute and then stall completely. It acted like it was not getting a steady supply of fuel or water was in the fuel. I eliminated a water problem by changing the onboard filter, the water/fuel separator (no water in it), and trying to run it using a gas can with fresh fuel. No change in starting behavior. I also replaced all the spark plugs that needed to be done anyway.
The LP fuel pumps had not been changed for 4-5 years so I replaced both pumps with new pumps and gaskets. There was no change in starting behavior, but I noticed that when I squeezed the primer bulb, the upper, new LP pump was leaking from the front seal, not from the back where it attaches to the engine. I pulled the pump and replaced with another new one.
When I replaced the pumps the first time, for easier access, I unbolted the oil tank and VST and moved them aside for easier access. I also disconnected some harness connectors to get wires out of the way.
As I said, the first time I replaced the pumps and put everything back together the engine cranked and started but still stalled after a short time. Now, after replacing the leaking upper LP pump and putting everything back together, the engine cranks but does not turn over at all. The only difference between pump replacements is that when I did the second upper LP pump replacement, when I unbolted the oil tank and let it hang down, some oil leaked out of the top tube on the tank that connects to the intake cover (it was not connected).
The bulb is firm, I don't smell any leaking gas, I can't find any connectors that I failed to reconnect, there is fuel in the VST tank.
I've got lots of questions on what the next debugging steps should be and what to check first.
- If there was an electrical connector that I forgot to reconnect, would the engine even crank?
- If I disconnected the fuel hose on the VST tank that comes from the LP pump , and cranked the engine, would seeing fuel being pumped verify the LP pumps were working and fuel was making it to the VST, or does the VST hose need to be connected for the LP pumps to work?
- I'm assuming the high pressure pump isn't a problem since the engine did start when I began all these repairs. Are there any connectors on the VST tank that could have come undone when I unbolted it and moved aside? I'm planning on unbolting it again so I take a good look. Anything else I should check?
I'll do a google search on how to test to see if the high pressure pump is getting power.
Any ideas on what else to look for and in what order to for possible problems?
Thanks for any help.