Fixed starter, now I have no fuel pressure. (YM-1600/2TR16

[Rocks91]

Since the prior owner ran it into some dead state, I would be prepared for anything, so I would not assume, I would "trust but verify", and check everything.

That sounds like fuel starvation to me. I would start at the tank and work my way downstream. Check for debris in the tank. The great thing about these engines is that they are pretty simple. Once you get fuel to the injectors, I would run a can or two of SeaFoam through it.

Feel free to post photos!

All the best,

Peter

I flushed the tank, replaced the gas filter with a water separator, and replaced the old clamps with high pressure clamps. i had fuel pressure at the injectors enough to fire the motor up for like 6 seconds. then it slowly died like the fuel pressure couldnt keep up. now i cant get anything from the pump. i was going to make a comment about using the word assume lol. it shouldnt matter but i also cant find the "thermostart" doodad anywhere or any wire whatsoever. id like to test and replace it.

 

[Rocks91]

If it fired up after changing the starter & then petered out, doesn’t sound like a fuel pump problem..
Disconnect the fuel inlet line at the injection pump and remove the fuel tank cap and back blow the line, towards the tank.. now let the fuel come back thru the line towards the inj pump and hook it up.. leave the tank cap off and try to start it..
Don’t forget to put the throttle into the wide open position..
Good luck

so you think there is air between the pump and the tank? ill try that. thankyou

 

[California]

Thermostart - or a plug if it isn't there - should be on the middle of the intake manifold above the starter.

 

[rScotty]

so you think there is air between the pump and the tank? ill try that. thankyou

I know this seems too simple, but the first thing to check if the fuel injector pump is below the level of the fuel filter, is to disconnect the fuel feed to the fuel injector pump. Fuel should run out freely until you turn off the lever on the fuel filter...and then start again when you open that lever. That's when you know that at least that much of the system is bled properly.
Then is when you connect and tighten the fuel injector pump feed line and then one at a time you slightly loosen/then tighten each injector line at its injector while cranking the starter. It's a messy job because fuel leaks out when you loosen it. Rags are the answer. You do that over and over until all the air is out of of each injector line.
Now it is bled properly and should be running.
You may have to repeat the whole procedure half a dozen times before all the air is out.

 

[careyo63]

For you to loose all fuel pressure sounds like a broken clogged fuel line before the Inj. Pump. May want to run a direct new Fuel line straight from the Tank to the pump. Your going to have to bleed the pump. If it runs you can almost rule out the Injection pump itself. and go back through it.
This is the Thermal start and the wire to the back of the Ing switch. Turn the Ign. key to Aux. to get power to the Thermal. 10 secouds should be enough to get hot! Rarely ever do I have the need to use it and have had to on occasion. Org. fuel Sys. And how I use the Thermal if I would need to. Never replaced the plastic cup reservoir. After I start it a squirt the remaining fuel back in
to the Tank.

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[R Barger]

For those of you who have not seen my earlier posts I bought an old used Yanmar. It was supposedly just run out of fuel and the guy couldn't get it started again. Well, nothing is ever that simple. I found out the guy probably burned up the starter trying to start it, so I had to go on a small adventure to find one. Finally, find one and it works great. I turned it over and got it started after priming but then it slowly died after about 5 seconds. i even lost all sign of smoke out of the stack. so I crack the lines by the injectors and find I have no fuel pressure. I tried working the governor arm and taking out the pump to inspect it but idk what good pump and bad pump look like from the outside lol. anyways, I'm assuming its a bad fuel pump that finally gave way. Please, tell me im wrong because this is getting expensive fast. If it helps I could take pics I just forget in the moment. Thankyou guys for all the help you've been giving me.

You said in post #1 you primed it and it started. If that means you used starting fluid [that's a bad thing]. You can damage your engine.

 

[Rocks91]

Thermostart - or a plug if it isn't there - should be on the middle of the intake manifold above the starter.

You said in post #1 you primed it and it started. If that means you used starting fluid [that's a bad thing]. You can damage your engine.

i didnt prime it completely. i dont like using ether.

 

[Rocks91]

For you to loose all fuel pressure sounds like a broken clogged fuel line before the Inj. Pump. May want to run a direct new Fuel line straight from the Tank to the pump. Your going to have to bleed the pump. If it runs you can almost rule out the Injection pump itself. and go back through it.
This is the Thermal start and the wire to the back of the Ing switch. Turn the Ign. key to Aux. to get power to the Thermal. 10 secouds should be enough to get hot! Rarely ever do I have the need to use it and have had to on occasion. Org. fuel Sys. And how I use the Thermal if I would need to. Never replaced the plastic cup reservoir. After I start it a squirt the remaining fuel back in
to the Tank.

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  Picture 095.jpg

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  1678719123129.png

  5.9 MB · Views: 328

ok so now im sure. my motor doesnt have the thermostart. its got a big green plug where its supposed to be

For you to loose all fuel pressure sounds like a broken clogged fuel line before the Inj. Pump. May want to run a direct new Fuel line straight from the Tank to the pump. Your going to have to bleed the pump. If it runs you can almost rule out the Injection pump itself. and go back through it.
This is the Thermal start and the wire to the back of the Ing switch. Turn the Ign. key to Aux. to get power to the Thermal. 10 secouds should be enough to get hot! Rarely ever do I have the need to use it and have had to on occasion. Org. fuel Sys. And how I use the Thermal if I would need to. Never replaced the plastic cup reservoir. After I start it a squirt the remaining fuel back in
to the Tank.

Attachments

• 
  Picture 095.jpg

  804.6 KB · Views: 283
• 
  1678719123129.png

  5.9 MB · Views: 328

For you to loose all fuel pressure sounds like a broken clogged fuel line before the Inj. Pump. May want to run a direct new Fuel line straight from the Tank to the pump. Your going to have to bleed the pump. If it runs you can almost rule out the Injection pump itself. and go back through it.
This is the Thermal start and the wire to the back of the Ing switch. Turn the Ign. key to Aux. to get power to the Thermal. 10 secouds should be enough to get hot! Rarely ever do I have the need to use it and have had to on occasion. Org. fuel Sys. And how I use the Thermal if I would need to. Never replaced the plastic cup reservoir. After I start it a squirt the remaining fuel back in
to the Tank.

Attachments

• 
  Picture 095.jpg

  804.6 KB · Views: 283
• 
  1678719123129.png

  5.9 MB · Views: 328

So it's good to know I'm not crazy. My ym1600 doesn't have thermostart. I guess, I'm just supposed to rely on the decomp lever. I fixed the fuel issue. I didn't bleed the pump inlet well enough. Now I'm just throwing white smoke and sorta popping off. A couple times it almost idled but I didn't want to burn up the starter and as soon as the starter shuts off the motor dies. It just seems like a cold blooded deisel now. Which, brings me to my next question. why the heck don't I have glow plugs or thermostart?

 

[California]

... why the heck don't I have glow plugs or thermostart?

Apparently that Yanmar was first sold in a location with a mild climate so it didn't need the cold-weather option.

If you have a heat gun - or steal your wife's hair dryer - prop it in place to thoroughly warm the intake manifold. Or prop it to push warm air into the air filter's inlet. This will duplicate the Thermostart's function.

White exhaust is unburned fuel vapor.

Don't use ether on these small displacement diesels!!!!! It can shatter the rings.

 

[winston1]

ok so now im sure. my motor doesnt have the thermostart. its got a big green plug where its supposed to be



So it's good to know I'm not crazy. My ym1600 doesn't have thermostart. I guess, I'm just supposed to rely on the decomp lever. I fixed the fuel issue. I didn't bleed the pump inlet well enough. Now I'm just throwing white smoke and sorta popping off. A couple times it almost idled but I didn't want to burn up the starter and as soon as the starter shuts off the motor dies. It just seems like a cold blooded deisel now. Which, brings me to my next question. why the heck don't I have glow plugs or thermostart?

Not sure you don't have a thermostart element. Notice the blue wire going up to the intake. Would appear to me that is a themostart element. They lock like this. Help Me Understand Yanmar Thermostarts Maybe you just need the reservoir. Thermostart Tank