Diesel primer air purging?
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Diesel primer air purging?
My primer pump doesn't seem to work like it used to. I have a problem with air building up when running on veg, and when I try to prime it I can feel that it's got air but it doesnt' expell the air like it used to, I just feel increased resistance as I push the primer pump which I assume is air pressure, and it just pushes back up when I release it. so I'm thinking there is probably some sort of air expulsion by-pass that is gummed up? If so do I need to remove the small assembly that the hand pump screws into, that is attached to the injector pump body by 3 10mm screws?
then what do I do?
Also if I put a good gum-out in the diesel might that clear the problem? I think I'll go do that today anyway since I imagine the veg oil builds up some gum over time so good policy?
ATM I can't run on veg at all, it immediately sucks air and stalls since I can't prime the air out of it.
It's partly because the veg greasecar system feeds the fuel from the injector pump straight back to the input instead of back to the tank, so if air isn't expelled I guess it just keeps going round and round. The advantage of this is it keeps the veg nice and hot.
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then what do I do?
Also if I put a good gum-out in the diesel might that clear the problem? I think I'll go do that today anyway since I imagine the veg oil builds up some gum over time so good policy?
ATM I can't run on veg at all, it immediately sucks air and stalls since I can't prime the air out of it.
It's partly because the veg greasecar system feeds the fuel from the injector pump straight back to the input instead of back to the tank, so if air isn't expelled I guess it just keeps going round and round. The advantage of this is it keeps the veg nice and hot.
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Michigan Dispensaries
Last edited by paddo; Feb 19, 2011 at 02:13 AM.
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OK I guess this problem is too advanced for the experts around here.
Well I rung a local dealer, seems the unit does not expel air, but there is some sort of check valve. I'm thinking that is a bit gummed up and when pumping air it just doesn't open, only opens with the higher pressure of pumping fluid. so I'll try to remove the 3 screws and inspect/clean up the insides of the small block that the hand pump screws into. However when removing the input line and blowing into it, it seems to blow in fine and prevent sucking back.
Hopefully the injector pump itself isn't gummed up. If so I wonder how to clean that up, sounds daunting.
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Extreme q
Well I rung a local dealer, seems the unit does not expel air, but there is some sort of check valve. I'm thinking that is a bit gummed up and when pumping air it just doesn't open, only opens with the higher pressure of pumping fluid. so I'll try to remove the 3 screws and inspect/clean up the insides of the small block that the hand pump screws into. However when removing the input line and blowing into it, it seems to blow in fine and prevent sucking back.
Hopefully the injector pump itself isn't gummed up. If so I wonder how to clean that up, sounds daunting.
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Extreme q
Last edited by paddo; Feb 19, 2011 at 02:13 AM.
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I thought that might get a response! Despite your disdain for innovation and contempt for recycling, I have had few problems with the system in nearly 2 years until now. I even wonder if veg oil is better for the engine due to being also a lubricant. I even had it running very well on pure filtered used sump oil very well just as an experiment, but that is probably too toxic to do regularly.
anyway got it going today, by using a long clear tube and attaching to a couple of points while using a rod to block off the otehr opening, and sucking to pressure test. Couldn't find any leaks so tried sucking from output of my grease fuel filter, sucked out some air until it was solid fuel. Although the air hadn't seemed to be coming from the filter but appearing on the input side (I have a permanent piece of clear fuel hose on input and out put of the filter so I can see what's going on), that seemed to fix the problem. I haven't driven it yet, but revving the engine did not cause air build up like before. I suppose the air was just going round and round.
I still would like to know what is wrong with the bleeding mechanism, it makes it much harder to bleed. But I'll keep the tube and a screw driver in the car from now on and let well enough alone for now. That is if the driving test doesn't fail today.
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CHEVROLET UPLANDER
anyway got it going today, by using a long clear tube and attaching to a couple of points while using a rod to block off the otehr opening, and sucking to pressure test. Couldn't find any leaks so tried sucking from output of my grease fuel filter, sucked out some air until it was solid fuel. Although the air hadn't seemed to be coming from the filter but appearing on the input side (I have a permanent piece of clear fuel hose on input and out put of the filter so I can see what's going on), that seemed to fix the problem. I haven't driven it yet, but revving the engine did not cause air build up like before. I suppose the air was just going round and round.
I still would like to know what is wrong with the bleeding mechanism, it makes it much harder to bleed. But I'll keep the tube and a screw driver in the car from now on and let well enough alone for now. That is if the driving test doesn't fail today.
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CHEVROLET UPLANDER
Last edited by paddo; Feb 19, 2011 at 02:14 AM.
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wow takes all kinds! 
guess you're really happy about all those Afghanis, Pakistanis and Palestinians being mass-murdered too, right? Great for the oil industry!
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guess you're really happy about all those Afghanis, Pakistanis and Palestinians being mass-murdered too, right? Great for the oil industry!
Innovation and recycling? HA! You're hardly doing either of those.
You have done what has been done to countless other diesels; illegally modified the fuel system to support a dirty, contaminated fuel that will destroy the car. There is nothing the slightest bit innovative about what you've done. You're just another sheep following the "green" fad.
You're not recycling, you're polluting. You're burning a dirty fuel in an old 1980's emissions standards level engine never designed to use it. You're cutting the vehicle's useflul lifespan significantly short and killing its resale value (to smart buyers that know what they are doing).
No, vegetable oil is a contaminant. If your engine is running so pooly that fuel is contacting the cylinder walls, you're doing far more environmental harm by driving it.
No kidding? I'm glad you figured that out before causing even more harm than you're already doing.
You have done what has been done to countless other diesels; illegally modified the fuel system to support a dirty, contaminated fuel that will destroy the car. There is nothing the slightest bit innovative about what you've done. You're just another sheep following the "green" fad.
You're not recycling, you're polluting. You're burning a dirty fuel in an old 1980's emissions standards level engine never designed to use it. You're cutting the vehicle's useflul lifespan significantly short and killing its resale value (to smart buyers that know what they are doing).
No, vegetable oil is a contaminant. If your engine is running so pooly that fuel is contacting the cylinder walls, you're doing far more environmental harm by driving it.
No kidding? I'm glad you figured that out before causing even more harm than you're already doing.
List Of Vehicles
Last edited by paddo; Feb 19, 2011 at 02:14 AM.
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I understand diesels were originally designed to run on veg oil.
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Last edited by paddo; Feb 19, 2011 at 02:14 AM.
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