doofus
02-28-2011, 04:09 AM
I recently purchased a 2007 model Supra 22ssv which is
fitted with an INDMAR Assault 340hp motor with the ETX-Cat catalytic
convertor.
Since purchasing the boat I have been regularly experiencing problems
where the engine won't start on very hot days. I have experienced this
problem at least 6-7 times since purchasing the boat in mid December
2010.
Every time that the problem has occurred, the ambient air temperature
has been around 36-38 degrees Celsius (100-110 Fahrenheit)
In each instance where the engine will not start the circumstances
have been pretty much identical in that we have been using the boat
for wakeboarding during the morning with no problems at all, but when
we pull back into the dock to have lunch, the engine will not restart
after we have had our lunch break.
Whilst using the boat in the mornings before these incidents
everything about the engine is operating is correctly with an engine
running temperature of around 162 - 164 degrees Fahrenheit. (I forgot
to mention that the boat is also fitted with a closed water cooling
system)
The very first time this problem happened the boat started for a
brief moment but then went into "limp mode" for a few seconds and then
shut down. I tried to restart the motor but it appeared to not be
getting any fuel delivery (it did have spark). I noticed when I lifted
the engine cover that was an intense amount of radiated heat in the
actual engine bay. Because of this I lifted all engine bay and storage hatches
allowing the heat around the motor to vent out, and after doing that
we were then able to start the boat about 15 minutes later.
Since that first incident we now always lift the engine cover between
wakeboarding sets, but despite doing so we have still experienced the
exact same problem 6 more times. The circumstances have been the same
each time the problem has occurred in that we have been using the boat all morning with no problems at all, it has been an extremely hot day, and once we stop using the boat for an extended period of time to have lunch, the engine will not restart until it has completely cooled back down.
The problem occurred again on Saturday of the weekend just gone. We
had used the boat all morning with no problems at all, but it would
not restart after lunch. We had all engine and ballast hatches fully
open whilst having lunch, but it still would not start. In the end I
resorted to slowly pouring water over the engine bay area and once the
engine temp was back down to around 120 degrees I was able to get the
motor started again. (I was able to get the engine started when the
engine temp was at about 145 degrees Fahrenheit, but it again appeared
to be in sort of "limp mode" where it was running with a pronounced
miss and revs were fluctuating wildly. I only ran the engine like this
for a short time and then quickly shut it back down when realising
that it was not running correctly) I then continued to slowly pour
water over the engine, and as mentioned above, was able to restart it
properly when the engine temperature was back down around the 120
degree mark. ( I also had the engine bay blower vents on to assist in
removing the radiated heat)
I am no marine mechanic, but the problem appears to be a fuel vapour lock
or lack of fuel pressure when it gets extremely hot. In every instance where the problem has occurred we have been using the boat
during the morning with no problems at all, and it is only after
having an extended break for lunch around midday that the boat wont
restart. This problem only ever occurs on extremely hot days when the
temperature is around the 36 -39 degree Celsius mark (100 - 110
Fahrenheit). We have never experienced the problem when the
temperature has been below 35 degrees Celsius.
Has anybody else ever experienced this sort of problem, and if so, how did you fix it?
fitted with an INDMAR Assault 340hp motor with the ETX-Cat catalytic
convertor.
Since purchasing the boat I have been regularly experiencing problems
where the engine won't start on very hot days. I have experienced this
problem at least 6-7 times since purchasing the boat in mid December
2010.
Every time that the problem has occurred, the ambient air temperature
has been around 36-38 degrees Celsius (100-110 Fahrenheit)
In each instance where the engine will not start the circumstances
have been pretty much identical in that we have been using the boat
for wakeboarding during the morning with no problems at all, but when
we pull back into the dock to have lunch, the engine will not restart
after we have had our lunch break.
Whilst using the boat in the mornings before these incidents
everything about the engine is operating is correctly with an engine
running temperature of around 162 - 164 degrees Fahrenheit. (I forgot
to mention that the boat is also fitted with a closed water cooling
system)
The very first time this problem happened the boat started for a
brief moment but then went into "limp mode" for a few seconds and then
shut down. I tried to restart the motor but it appeared to not be
getting any fuel delivery (it did have spark). I noticed when I lifted
the engine cover that was an intense amount of radiated heat in the
actual engine bay. Because of this I lifted all engine bay and storage hatches
allowing the heat around the motor to vent out, and after doing that
we were then able to start the boat about 15 minutes later.
Since that first incident we now always lift the engine cover between
wakeboarding sets, but despite doing so we have still experienced the
exact same problem 6 more times. The circumstances have been the same
each time the problem has occurred in that we have been using the boat all morning with no problems at all, it has been an extremely hot day, and once we stop using the boat for an extended period of time to have lunch, the engine will not restart until it has completely cooled back down.
The problem occurred again on Saturday of the weekend just gone. We
had used the boat all morning with no problems at all, but it would
not restart after lunch. We had all engine and ballast hatches fully
open whilst having lunch, but it still would not start. In the end I
resorted to slowly pouring water over the engine bay area and once the
engine temp was back down to around 120 degrees I was able to get the
motor started again. (I was able to get the engine started when the
engine temp was at about 145 degrees Fahrenheit, but it again appeared
to be in sort of "limp mode" where it was running with a pronounced
miss and revs were fluctuating wildly. I only ran the engine like this
for a short time and then quickly shut it back down when realising
that it was not running correctly) I then continued to slowly pour
water over the engine, and as mentioned above, was able to restart it
properly when the engine temperature was back down around the 120
degree mark. ( I also had the engine bay blower vents on to assist in
removing the radiated heat)
I am no marine mechanic, but the problem appears to be a fuel vapour lock
or lack of fuel pressure when it gets extremely hot. In every instance where the problem has occurred we have been using the boat
during the morning with no problems at all, and it is only after
having an extended break for lunch around midday that the boat wont
restart. This problem only ever occurs on extremely hot days when the
temperature is around the 36 -39 degree Celsius mark (100 - 110
Fahrenheit). We have never experienced the problem when the
temperature has been below 35 degrees Celsius.
Has anybody else ever experienced this sort of problem, and if so, how did you fix it?