I'm really not sure if anyone can help me with this, but no one can make it out here until Monday so I thought it would be worth a quick post.
So I am cranking and cranking and cranking and nothing. I've got a healthy spark, and recently replaced coil and air filter. Plugs look good. Cap and rotor and wires are alright. That leads me to believe the issue is no fuel. I have tried another propane bottle, same. I purged the pressure in the line and tried again, still nothing. This model I am pretty sure has the converter and regulator built into the same unit. I cannot seem to find a fuel filter. There was a bit of sticky black goo (looks like molasses) near the bottom of the outside of the diaphragm. I have not removed the diaphragm, just the two covers and solenoid on top of it (for cleaning). Used MAF sensor cleaner since it's plastic and rubber "safe".
Pressure is definitely making it TO the pressure regulator, as I got blasted pretty hard with propane when I depressed the spring at the hose that connects to the bottle. However, the large top hose coming out of the pressure regulator going to the carbeorator had a very small amount of pressure being pushed out of it at one time when I was checking for pressure, but now when I crank I am getting absolutely NOTHING out of it. Since there WAS a little bit (and I mean a very little bit) of pressure when I checked what was exiting that larger hose earlier and now there is NONE, I can only think that it is a pressure issue.
What bothers me is that if the diaphragm in the regulator was blown, wouldn't that mean I would have an excess of pressure? All I can think is that it is either a flow control signal that is not opening a solenoid, a faulting flow control solenoid not opening, or a safety valve detecting excessive pressure and closing. The manual that I have for this truck does NOT go into detail on the fuel system. Any advice is most appreciated.
Thanks for reading!
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So my Yale tech at Pape Material Handling told me that this AISAN unit cannot be rebuilt and that I would have to buy a whole new unit for $830! So of course as a welder having rebuilt countless pressure regulators, I looked into it and found a few rebuild kits for these AISAN units. And when I told them that I was going to rebuild my AISAN unit, they wanted to charge me over $200 for the rebuild kit when the most expensive one I found online was $93. But what bothers me the most is how quick they went from telling me that I needed to buy a new unit to trying to sell me the rebuild kit. And of course there is the fact that they wanted to charge me $830 when they go for about HALF that. I am starting to think that this outfit is a joke. I will give them the benefit of the doubt, pay one of their techs ONCE to come out, work with the tech on everything that the tech does while the tech is here, and form an opinion after the tech tells me his opinion on this bulls%&t. I mean, I EXPECT shady practices from auto shops, but from a lift truck DEALER? Wow...just...wow.
Sorry I was wrong. I thought this truck was older, wrong system.
Okay BREWSKI and stam, I just received word from our Yale tech up here in WA, he says that I have an AISAN (not asian) converter/regulator, and that these units need to be drained of sludge every 100 hours. He is recommending that I buy a new unit as it has never to my knowledge been drained and I have been here for two plus years. I do not have a maintenance manual for this truck, and have no idea how to drain "sludge" from this unit. I am wondering if my AISAN unit has failed, how to test this, and how to drain the "sludge". Anyone have any idea? Thanks again!
Okay stam, I am not seeing any vacuum lines going to the regulator. I do, however, see a giant 1/2" line going from the intake manifold to the bottom of the regulator. I am a bit confused as to how this vacuum allows fuel to flow...are you saying that there should be vacuum at the carb where the large fuel supply line from the regulator meets the carb? If so, there is no vacuum there upon cranking. I didn't think there was vacuum until ignition though...it's not firing at all.
I will look inside the mixer (carb). I did check that the fuel lockoff solenoid was magnetizing upon cranking, and it is. I will check the carb now. Where is this mixer diaphragm? Can I just check to see if there is vacuum coming out through a hose before I go tearing into the carb?
Thanks stam.
just wanted to add something.
the regulator wont just dump fuel out to the mixer, there need to be vacuum on that hose then the fuel will be sucked in.
have you looked inside the mixer (carb) yet? broken mixer diaphragm can do this.
Thanks for the speedy reply, BREWSKI. I am getting 9.6 volts to the fuel lock off. I assume that while the 9.6 VDC is applied to the solenoid it opens the pathway for fuel to flow. I have already cleaned the fuel lockoff solenoid. I also cleaned the fuel filter, assuming that it is the little piece of felt underneath that cover on the front of the regulator/converter. I will try holding a screwdriver to it to see if it is magnetizing...possible the coil is shot.
Thanks for clarifying these parts! I will post more when I find more.
The regulator should have two solenoids on it. The large solenoid on the bottom solenoid should be the fuel lockoff. Check to see that you are getting power to it. If you are try holding a screw driver to iy while you are cranking to see if it is magnetizing. If it is pull the solenoid and clean it. The filter is in the cover above the lock off solenoid in the regulator.
Have you tried giving it an ol' fashioned shot of starting fluid?
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