Hi all, I've just had an issue where my Nissan 15 forklift is swallowing gas bottles, it got to the point where it wouldn't run well top end and regulator was freezing.
Lock off is vff30, regulator is model J and mixer is a CA100, all impco.
I'll start by saying all of this could be non standard, there's a lot of cut and blocked hoses + fuel pipes (petrol functionality is gone), I don't really know the correct configuration for vacuum hoses.
From the intake manifold upwards, first component seems to be a throttle body with a butterfly that is controlled by a vacuum piston, seized, stuck open, no vacuums connected to it. Next component is a throttle body with a butterfly, throttle cable connects to this, next component up looks like a carburettor, float bowl etc, fuel lines cut and bent, hoses all cut and blocked, I bet it serves no function either, and last component is the CA100 mixer by way of some kind of air horn adapter.
My first question is.. I'd love to delete the first component and the third component. The first seems to do absolutely nothing, the third seems to only serve as a point to hold the throttle cable. I could machine short aluminium bodies to replace both components, lower profile, would clean the engine bay up and eliminate all those potential leaks etc. Is this a good idea, or better to leave it alone?
I've replaced all components inside the vff30 and modelJ, couldn't find one for the mixer but looked inside it also and all looks fine. I don't really understand how the mixer works or how the engine is getting more gas at higher throttle settings, and how I'd adjust this? The mixer has one nipple on the body (on top of the diaphragm/non engine side) it appears a vacuum would pull the diaphragm and gas valve open, is this an enriching function, why would you want to pull the gas valve open under closed throttle position? Where should it connect to? I've found it won't idle well unless I connect this to a vacuum port on the carburettor but it won't run well at top end unless I then pinch this hose.
Further down, below the diaphragm are two vacuum nipples, both cut and plugged.
I can't find anything that looks quite like it with an online search and I'm rather stumped.
I should also add, I have two of these forklifts - this one has always been a better runner than the newer one I bought that hadn't been tampered with, but the newer one uses different components..
Photo of components below. Thanks in advance of course!
https://i.ibb.co/42VJ3BF/20220212-114156.jpg
Showing items 1 - 3 of 3 results.
What l remember is there was a 12volt small solidnoid that controlled the vacuum when was running on gasoline it lifted up the diaphragm for unrestricted air flow
Thanks Scott, definitely helpful good to know that first component is a governor, I hadn't thought of that. This machine is definitely ungoverened which makes sense being that that piston is seized. So it could still be deleted.
The carb could be deleted too i think, as the throttle body below it would still behave as a throttle for the ca100 mixer.
I ended up putting it back together as is. I opened the power screw a touch and it is running really well now. Though I do have that diaphragm nipple connected to a vacuum port on the throttle barrel (second component). It definitely doesn't run as well with it disconnected, and doesn't run as well with it connected to manifold vacuum. Maybe cooincidental that it does run with it connected here, could be that it's tuned wrong and this vacuum connection happens to balance it about right? What should it be connected to, under normal dual fuel operation?
What you have is a truck that was set up for dual fuel at one time. As you said there is lines bent l am thinking that the gasoline is no longer being used.as for removing some parts you would have to disable the gas if not being used first l would take off the fuel pump and put a plate over the hole with gasket than get rid of all the gas lines drain the tank of any old gas. next the first part in the photo is a governer you need that that governs the rpms of the moter the next part looks like the throttle and the next part is the gasoline carb you would not need them any more.the problem is you will have to buy a new ca100 that is for propane only there is no way to use the ca100 that you have now because it goes between the gas carb and air intake there is no throttle on that carb.also the hose that is coming off the side of the ca100 is to hold the diaphragm from moving when the truck was running on gasoline also you might need a different throttle cable set up because the carb will now be bolted to the intake manifold.a lot to think about hope l was of help.
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