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BF225 2004 Crank no start

I

im2fast4you33

New member
Sorry for the long post in advanced, looking for a bit of advice for anything I may have missed.

Was underway at about 4k rpm after about 5 or 6 hours of idling/moderate running. Boat suddenly hiccupped then died. Would crank, but no start.

Here is what ive done so far...

1. Took out top plug and cranked, I have spark.

2. Verified I have fuel going in and out of the LP fuel pump while squeezing bulb and cranking. So VST is getting fuel.

3. Verified that on 'key on' I hear the HP pump turn on. It is very quiet.

4. Followed fuel line from the HP filter to the top of the rail, disconnected from the rail. I get no fuel when 'key on' or cranking.

Can I assume from this, my HP fuel pump as failed? A bit of background, a month ago I removed and 'serviced' the VST. Almost all the screws were frozen, but I was able to remove the pump and clean the fine filter, things ran great afterwards. I have no access to the float assembly without drilling out every screw.

I plan to replace the entire VST, since its original, and im assuming the pump is as well. Should I be looking at anything else before committing to this?
 
The first thing I would do is pull the HP fuel filter to see if has collapsed. If so. replace. These engines are VERY sensitive to problems with that HP fuel filter.

The fuel line from the HP fuel pump should first go to the fuel pressure regulator. Inside there is yet another fuel screen. Remove the regulator and clean it with carb cleaner and especially the screen within.

If still no start, I would attach a fuel pressure gauge to the fuel pressure relief bolt on top of the HP fuel filter cover. You will need a 6 mm adapter. Crank the engine and observe the fuel pressure. Normal when running at idle and vacuum line to the fuel pressure regulator pinched shut, is between 41 and 48 PSI. If pressure is very high, you have a blockage upstream - either the fuel pressure regulator, or the filter screen going into the injector rail. If very low, then you have a blockage downstream. First, I would suspect is a stuck or failed float valve in the VST.
 
chawk_man said:
The first thing I would do is pull the HP fuel filter to see if has collapsed. If so. replace. These engines are VERY sensitive to problems with that HP fuel filter.

The fuel line from the HP fuel pump should first go to the fuel pressure regulator. Inside there is yet another fuel screen. Remove the regulator and clean it with carb cleaner and especially the screen within.

If still no start, I would attach a fuel pressure gauge to the fuel pressure relief bolt on top of the HP fuel filter cover. You will need a 6 mm adapter. Crank the engine and observe the fuel pressure. Normal when running at idle and vacuum line to the fuel pressure regulator pinched shut, is between 41 and 48 PSI. If pressure is very high, you have a blockage upstream - either the fuel pressure regulator, or the filter screen going into the injector rail. If very low, then you have a blockage downstream. First, I would suspect is a stuck or failed float valve in the VST.
Click to expand...

Thanks for the reply. So fuel filter hi and kow fuel filters were replaced maybe 50 hours ago with OEM, I checked them, but they're fine.

The fuel routing is very confusing to me. It looks like right off the filter area, it goes to the top rail on the starboard side. On the port side is the pressure regulator, however it just has a vacuum line, and a return line. This in theory should mean fuel goes to the starboard rail first.

However, I did attach a fuel guage to the port off the HP fuel filter area, threaded a 6mm adapter and with both key on and cranking, 0 pressure. To verify, when I take the hose off and just leave the fitting, it barely dribbles out...
 
If you just got a dribble out of the pressure relief bolt opening, the suggests that your fuel pump isn't working or that you have a blockage downstream, possibly float valve stuck in the VST.

Attached is a link to the shop manual. Download. It's a PDF file. You may need to fool with it a bit to get it the right size.

Go to Chapter 5. Go through the diagnostics.
 
chawk_man said:
If you just got a dribble out of the pressure relief bolt opening, the suggests that your fuel pump isn't working or that you have a blockage downstream, possibly float valve stuck in the VST.

Attached is a link to the shop manual. Download. It's a PDF file. You may need to fool with it a bit to get it the right size.

Go to Chapter 5. Go through the diagnostics.
Click to expand...
Hmm I dont see a link anywhere
 
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