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motor wont start!!

D

difran25

New member
i have a stock merc 454 mag mpi. i went there today and started it right up first turn like it always does, i put stabul in the gas, changed the oil, oil filter and fuel filter. i didnt fill the fuel filter..........i started the boat and it ran then shut off. i remember then i filled the filter with fuel then tried again. it turns over but will not fire up. could it be anything else? fuel pump? did i run the line dry and now its not getting any gas. its fuel injected so pumping doesnt really help. please help.
 
difran25 said:
i have a stock merc 454 mag mpi. i went there today and started it right up first turn like it always does, i put stabul in the gas, changed the oil, oil filter and fuel filter. i didnt fill the fuel filter..........i started the boat and it ran then shut off. i remember then i filled the filter with fuel then tried again. it turns over but will not fire up. could it be anything else? fuel pump? did i run the line dry and now its not getting any gas. its fuel injected so pumping doesnt really help. please help.
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i dont know if this will help. if u changed the inline fuel filter make sure it is not in backwards. it may starve it for fuel. there should be an arrow for flow.
 
Hey,
Shot in the dark--- TWO THINGS
1-make sure you hear the fuel pump priming up when you turn the key to on.(you can cycle it a few times to make sure its there) Also, if you do, go ahead and push the schrader valve(sp) on the fuel rail(should look something like a bike tire valve), it should squirt fuel so be careful-if there is air in there that should purge it out.
2-i know this is stupid, but its happen to me before! Make sure you just trace your steps where your hands and or any extremety of your body and make sure you didnt unclip anything on accident.
Hope this helps
Jersey
 
You changed a water seperator not the fuel filter,but do check the fuel rail to make sure it has fuel in it not air.Remember it is under pressure,so it should squirt fuel.Hope this helps.
 
gbtrkdrvr said:
You changed a water seperator not the fuel filter,but do check the fuel rail to make sure it has fuel in it not air.Remember it is under pressure,so it should squirt fuel.Hope this helps.
Click to expand...

Water seperator / fuel filter whats the differance ??
 
Big Red said:
Water seperator / fuel filter whats the differance ??
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The fuel filter is more similar to the oil filter, where it cleans the "dirt matter" from the fuel. The seperator takes fuel through it seperating the water to the bottom allowing just fuel to travel to your engine.
 
cturboaddict said:
The fuel filter is more similar to the oil filter, where it cleans the "dirt matter" from the fuel. The seperator takes fuel through it seperating the water to the bottom allowing just fuel to travel to your engine.
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So what you are telling me is the water seperator does not filter dirt only water
 
Here, i copy and pasted this-

Plastic or aluminum is the preferred material for marine fuel water separators. These draw out water from the boat fuel which prevents water from getting into the motor. The presence of water in the motor can cause a steam explosion. This would easily damage the boat cylinders including the entire motor. The separator can be part of a primary filter or may be installed as a secondary filter. Separators drain off water in either of two ways. When the separator is part of a primary filter, water may be siphoned off by the filter. The motor gets rid of the waste water along with contaminants through this method.
When the separator is installed as a secondary filter, a siphoning mechanism is used to expel the waste water and contaminants. Water and fuel are pumped into a filter and subjected to a rapid spinning motion. The water and unwanted contaminants sink to the bottom while the fuel remains on top. This is siphoned to the fuel line. The waste water is eventually drained off as need arises. Some marine fuel water separators are designed to clean the exhaust system of the boat motor as they drain. These function in collaboration with the exhaustion system to clean it along with the fuel. It is best to replace a marine fuel water separator every year.
 
Some systems are hard to prime after you change the fuel/water separator filter.

I use a outboard primer bulb with hose on it and attach it after the filter and pump it until fuel comes out . then hook the hose back up to the pump. if there is no other problems this cures the no starting every time.
 
cturboaddict said:
Here, i copy and pasted this-

Plastic or aluminum is the preferred material for marine fuel water separators. These draw out water from the boat fuel which prevents water from getting into the motor. The presence of water in the motor can cause a steam explosion. This would easily damage the boat cylinders including the entire motor. The separator can be part of a primary filter or may be installed as a secondary filter. Separators drain off water in either of two ways. When the separator is part of a primary filter, water may be siphoned off by the filter. The motor gets rid of the waste water along with contaminants through this method.
When the separator is installed as a secondary filter, a siphoning mechanism is used to expel the waste water and contaminants. Water and fuel are pumped into a filter and subjected to a rapid spinning motion. The water and unwanted contaminants sink to the bottom while the fuel remains on top. This is siphoned to the fuel line. The waste water is eventually drained off as need arises. Some marine fuel water separators are designed to clean the exhaust system of the boat motor as they drain. These function in collaboration with the exhaustion system to clean it along with the fuel. It is best to replace a marine fuel water separator every year.
Click to expand...

Oh yea I have seen this before, you must of copy and pasted it from Marine rocket sience from the fifties. great stuff.
 
It is quite possible that you damaged your electric fuel pump by running it dry. These pumps are designed to push fuel, not pull from the tank (sounds silly huh) It may have overheated and burned up, or possibly just blew the fuse, the fuse is located in the electric box on top of the engine where your ecm is located. Be sure to check all grounds along with the plug in for the fuel pump (port side low and aft) making sure its connected and free of corrosion. This is also a good spot to check for proper power. You may also try and provide power to your fuel pump here to check and see if its working properly. If you have a fuel pressure guage test kit, you can simply connect this to the fitting on the fuel rail, turn the key and see if you pressure up. should be around 40-42 lbs.
 
I just remembered, the 454 mpi's came in two configurations. One version came with the VST tank (a big carbuator like float assembly) this would be located on top of the engine next to the electric box with the ECM in it. This is probably the stet up, because you started and ran the engine. The newer set up is the pump assembly and fuel regulator bolted to the port forward engine mount.
 
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