Fuel pressure was 38 psi, engine off, ignition off. Pressure held 37 psi for 3 minutes. It did this before removing and testing the injectors. Reinstalled the injectors with new O-rings. All oil/fuel...
Type: Posts; User: Proline25
Fuel pressure was 38 psi, engine off, ignition off. Pressure held 37 psi for 3 minutes. It did this before removing and testing the injectors. Reinstalled the injectors with new O-rings. All oil/fuel...
serial #OT666332, 2004 250 EFI . I posted this issue with this motor almost 2 years ago. It has rarely occurred in the past year but now it is back and worse than ever. Motor starts great when cold....
What have you seen as the main failure? Open too early and not letting the motor heat up to 120 or overheating issues?
I was testing my Mercury thermostats yesterday. One started to open around 110 but didn't fully close after letting it cool, one opened at about 135. I found the spare Mercury thermostat in the...
Thanks, I'll do that.
2004 250 EFI #OT666332 Ran a compression check yesterday during spring maintenance. All cylinders were 125psi, same as every year. I took a picture of the pistons through the sparkplug hole just to...
serial #OT666332, 2004 250 EFI. Started the spring motor maintenance today. Fuel pressure is good, engine off, key on, hits 45 PSI instantly and drops down to 41 when the fuel pump times out. How...
It's a universal fuel pressure test kit that I bought about 15 years ago. It has everything that I need for the LS motors and most other injector rail lines for Mercruisers, common cars and trucks...
2004 250 EFI. I have lost the adapter for the schrader valve on the VST. I have a fuel injector test kit but the adapter for the small schrader is missing. Does anyone know the size or where I can...
OK, thanks. I don't remember how I ended up with the NGK's. I'll go back with the OEM Champions.
serial #OT666332, 2004 250 EFI. I don't want this to turn into a "what's the best oil" thread but I am going to ask about the spark plugs. My motor calls for Champion QL77CC plugs. I have been...
I have a 2004 250 EFI (ot666332), with only about 500 hrs. Had it out yesterday on a 20 mile run and it runs great. 1.95 mpg at 4200 rpm and 35 mph pushing a 250 Proline CC. I keep this motor well...
117 is the highest temp at low speed in long "no wake" zones, it never sees over 117. Set an alarm once at just over 130 or 135 due to a bad thermostat. 114 is the normal temp at low speed, about...
I don't recall the size. I just went to friends hydraulic shop and went through the viton o-rings until I found the best fit.
Mine was leaking two years ago. I replaced the O-ring. Been great since. It's operated as an analog 12 volt pump so primed it via 12 volt input pulses. 519907
2004 250 EFI, OT666332, Time to replace water pump impellor and check thermostats as normal maintenance. After reading several posts from owners asking if their engine is running too cold, I am...
I may not be fully understanding the issue. Your engine runs 110* and you want it to run higher? My 250 EFI has new thermostats and the engine quickly gets up to 112*, stays there all day if at idle....
Is this a random issue? Can you use the throttle to increase the idle speed to start it and let it idle at slightly higher RPM for a few seconds and then drop it back to idle speed? Having the same...
Ambient temperature that day about 70, engine off for about 15 minutes but it was running at 106 before I dropped anchor and shut the motor down. Possible injector dribbling fuel? Would it be worth...
serial #OT666332, 2004 250 EFI. Took the boat out for a 10 mile offshore run yesterday. Got hit with a fog bank while stopped at a fishing spot so we cut it short and headed home. The motor started...
The vessel view is nice when dealing with a 140 gallon fuel tank and monitoring fuel burn, but with only 40 gallons, it would seem easy to fill the tank and know how much fuel is remaining with a...
I have the 2004 250 HP EFI and I'm using the Vessel View Mobile Bluetooth through my phone. Works great, easy to install. Water pressure, fuel flow, water temp and more is easy to set up on custom...
Is it the shifter, the cable or the mechanics on the engine? Unhook the shift cable and see exactly where the problem is.
OK, thanks. Just never noticed it until all the salt-X foam.
Try a used outboard salvage company?
