thomasando
Cadet
- Joined
- Jan 20, 2013
- Messages
- 22
Edit - Ooops - motor is a 1977 75HP!
I've done a bit of reading on this already, but not sure what it may be.
This has happened now twice, both times with the motor warm. The scenario - starts perfectly when cold, runs absolutely fine for quite some time out to the first fishing spot. Move a couple of times throughout the day. All of a sudden, go to start it to move and it won't start. Both times it happened it was only about 20-30mins from shutting the motor off to trying to restart, and the weather was not cold (30deg C plus).
The motor turns over fine but won't fire straight away. After a few goes, it will 'pop' (or backfire, maybe) and the starter will disengage but the motor will not start. Try to start again, same situation. This goes on a few times until eventually it will start. When it starts, it idles rough for a few seconds and then is fine. There's no lag or issues when putting the power on. Both times it happened, I moved locations, shut it down and it started perfectly (first touch of the key) for the rest of the trip.
Both times it happened it was the same scenario. The first time took about 8 tries to get it to start, second time was 3 or 4. The first time I thought I might have been out of fuel so switched tanks and it started straight away. The second time, I knew I had enough fuel and switched tanks - it did not start, so I switched back.
I also had some issues starting it cold (yes, used choke) on another occassion however I think that was due to not priming properly from the front fuel tank (I've had some issues getting it primed).
This is my first boat, I've only owned it for about 4 weeks. The motor has less than 200hrs since a full rebuild. I bought it off my uncle (a small engine/marine mechanic) and it is in excellent shape. He has owned the boat for ~20yrs with the same motor and did a lot of work on it for me before I bought it, to ensure it would be trouble free.
Any tips on some simple diagnosis I can do next time to try and track the issue? Could a bad fuel pump diaphragm exhibit this behaviour?
I've done a bit of reading on this already, but not sure what it may be.
This has happened now twice, both times with the motor warm. The scenario - starts perfectly when cold, runs absolutely fine for quite some time out to the first fishing spot. Move a couple of times throughout the day. All of a sudden, go to start it to move and it won't start. Both times it happened it was only about 20-30mins from shutting the motor off to trying to restart, and the weather was not cold (30deg C plus).
The motor turns over fine but won't fire straight away. After a few goes, it will 'pop' (or backfire, maybe) and the starter will disengage but the motor will not start. Try to start again, same situation. This goes on a few times until eventually it will start. When it starts, it idles rough for a few seconds and then is fine. There's no lag or issues when putting the power on. Both times it happened, I moved locations, shut it down and it started perfectly (first touch of the key) for the rest of the trip.
Both times it happened it was the same scenario. The first time took about 8 tries to get it to start, second time was 3 or 4. The first time I thought I might have been out of fuel so switched tanks and it started straight away. The second time, I knew I had enough fuel and switched tanks - it did not start, so I switched back.
I also had some issues starting it cold (yes, used choke) on another occassion however I think that was due to not priming properly from the front fuel tank (I've had some issues getting it primed).
This is my first boat, I've only owned it for about 4 weeks. The motor has less than 200hrs since a full rebuild. I bought it off my uncle (a small engine/marine mechanic) and it is in excellent shape. He has owned the boat for ~20yrs with the same motor and did a lot of work on it for me before I bought it, to ensure it would be trouble free.
Any tips on some simple diagnosis I can do next time to try and track the issue? Could a bad fuel pump diaphragm exhibit this behaviour?