FASTdan
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| posted on 14/5/14 at 11:35 AM |
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Fluid for fuel pump test rig
I am looking to set up a test rig for both fuel pumps and carburettors. Can anyone suggest a 'friendly' medium to use as the fluid (really
do not want to be playing with fuel) that will provide some lubrication (assume water will kill a fuel pump reasonably quickly, especially if stood
unused) but isn't horrible to work with.
My only thought so far is cutting tool coolant/lubricant?
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mookaloid
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| posted on 14/5/14 at 11:39 AM |
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I imagine that any test liquid will need to have exactly the same characteristics as petrol for the tests to be meaningful.
The best stuff to use would therefore probably be petrol........
"That thing you're thinking - it wont be that."
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dinosaurjuice
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| posted on 14/5/14 at 11:50 AM |
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diesel would be safer, but i have no idea if petrol pumps/injectors etc are compatible and if the viscosity would be an issue.
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mcerd1
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| posted on 14/5/14 at 12:02 PM |
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these guys say they are using 'safety clean solution' (spelling?) what ever that is...
http://www.youtube.com/watch?v=SYec40tugsQ
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coyoteboy
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| posted on 14/5/14 at 12:39 PM |
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If you want flow rates to be representative you're going to need to use the same material or one damned close. Would it be easier to quench the
area with CO2 and good ventillation?
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mark chandler
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| posted on 14/5/14 at 01:53 PM |
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When I was playing around at this checking some old injectors had a decent spray pattern I used cellulose thinners.
I cobbled up an adjustable FPR by welding a bolt into a standard one so I could vary the load on the spring, pointed the injector into a big pickle
jar and used a battery charger with only one diode to pulse the injector and run the pump.
After 15 minutes at 4bar I had some pretty tired spray patterns and flow rates vastly improved, I guess the thinners also cleaned everything up.
Flow rates do not matter as much as getting the injectors all running the same, provided you start with something that should be correct in the first
instance.
I also knew someone who filled their car with diesel and drove until it conked out, once the fuel was replaced she said it had never ran so fast so
maybe diesel is the way forward?
Regards Mark
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redturner
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| posted on 14/5/14 at 07:27 PM |
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Dan, why not try some Fusous oil, probably spelt it wrong. We use this to protect engines that were being laid up. Run to engine on it until all the
pipes were charged, then stop the engine. It is a fine oil, that will burn, but it will take a lot more than a match/spark and has lubricating
qualities.
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Kdempsie
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| posted on 14/5/14 at 07:58 PM |
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The fluid used to test forecourt petrol pumps is called ISOPAR L. it is used because it has a higher flash point than petrol, not sure if you can buy
it in small amounts though.
Regards,
Keith.
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coyoteboy
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| posted on 15/5/14 at 12:00 PM |
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quote:
After 15 minutes at 4bar I had some pretty tired spray patterns and flow rates vastly improved, I guess the thinners also cleaned everything up.
Or the injector internals worn now due to lack of lubricity and sealing surface damage along with cleaning the nozzle 
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DW100
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| posted on 15/5/14 at 12:21 PM |
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What are you aiming to do in the test?
A lot of industry testing is done with white spirit (Also known as Stoddard solvent in the US). Can't say how much safer it is though.
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owelly
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| posted on 15/5/14 at 04:57 PM |
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We use Mineral Colza oil to set injectors and pumps on diesel sets. Istr it being suitable for petrol pumps and injectors too.
http://www.ppcmag.co.uk
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redturner
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| posted on 15/5/14 at 05:27 PM |
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Mineral Colza oil, havent heard of that for a long time. We used it in the oil lamps down the pits...............
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coyoteboy
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| posted on 20/5/14 at 06:41 AM |
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That's rapeseed oil, would seem a bit viscous for petrol?
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The Black Flash
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| posted on 21/5/14 at 12:28 PM |
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When I was at the rolling road, the guy put the injectors on the test rig. I asked him what they used, and it was a hydrocarbon solution specifically
for testing, but I've not been able to find it on google.
White spirit will definately be safer than petrol as it doesn't flash nearly as easily, or burn as quickly.
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