Fuel injector pressurized test setup?

[pontoon]

Hi all,

I know it’s possible to build a fuel injector test setup. The idea is to pressurize a liquid chamber which is connected to the injector which is off the vehicle. You can then use an electric pulse generator to fire the injector at a steady rate and measure the volume or weight over time.

Here’s a video showing what I’m talking about.

Is there a product like this that can test 6 at once? Testing one at a time is ok as well.

I’m hoping for something simple that isn’t too expensive. I already have an electronic fuel injector pulse generator. All I need is the pressurized fuel supply for the injectors. I also have a test tube (not 6).

 

[2ndGearRubber]

I think the simplest way would be some junk yard fuel rails, and a cheapo fuel pump mounted in a fuel can. We used to do something similar for demo-derby cars, drop the pump and sock into the jerry can, pressure output line and 2 wires went in through the lid, as did the return line if required.

You'll need to add a schrader valve something similar to ensure the system is fully bleed to start. Or just spray a good bit through the injector until you're confident there's no air.


Do you have a specific injector you plan on testing, or application? If I do an injector drop test, I'll just spray the injector straight into the cylinder, then crank over at WOT with fuel disabled. Depends on how much fuel you want to spray. The more you spray, obviously the easier it is to find discrepancies. I'm usually pulsing for less than 2 seconds, sometimes less than 1. Granted, I don't do injector drop very often.

Another option, if possible, is simply having a pressure transducer in the fuel line. It can record drops digitally, and compare on time vs when the injector actually begins flowing. You can also do this on a running engine to compare rail pressure changes in real time.

 

[richfinn]

https://www.asnu.com/injector-diagnostics

This company in the UK builds the best ones I have seen but Autel/Launch also sell cheaper versions

Just google "Asnu injector tester" and you will find the cheaper versions

 

[Buckaroo5]

Something like this, along with a fuel pressure gauge, can assess injector balance on car.

https://www.amazon.com/dp/B0002SR5OO/?tag=atomicindus08-20

Lots to doing accurate flow testing - I have used WitchHunter before for testing & rebuilding. He has some discussion on his website about test apparatus. He uses a modified ASNU tester.

https://witchhunter.com/witchhunterequip1.php

 

[matt_i]

Note of caution, no easier way to start a fire than with raw hydrocarbon fuel vapor.

A shop I worked in used Stoddard Solvent for testing injector flow rates, integrated over time, which had a lower flash point and was somehow correlated to values with gasoline.

 

[texasprd]

I think someone asked a very similar question in here a few weeks/months ago - or possibly in the General Garage Discussion forum. Try searching these two forums for "injector tester", "injector test bench", and the like, and see if that turns up some additional threads