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I want to do a fuel pump volume test on my 98 Mazda 62 2L GF, but the WSM doesn't say how long to energize the injectors:

enter image description here

I'll probably activate the injector by back probing the injector ground wire and then grounding it. I guess the Special Service Tool they use may have timing built in.

Robert S. Barnes
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  • I cannot see your image, so will ask the question ... are your injectors side or top fed? The MCM guys did an injector test. They used a graduated cylinder to calculate flow through the injector. They measured the time it took to flow 100ml, IIRC. They tested each injector at this rate to see how closely they were matched and to see the spray pattern of the injector. I don't know if this is what you are trying to accomplish. – Pᴀᴜʟsᴛᴇʀ2 Dec 06 '16 at 14:00
  • @Pᴀᴜʟsᴛᴇʀ2 It says in the WSM to turn the injector on, measure 56-61 milliliters and turn the injector off. If not as specified, replace the injector. Doesn't make allot of sense to me. – Robert S. Barnes Dec 06 '16 at 17:36

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According to agcoauto.com the length of time that you are supposed to let the fuel flow is 15 seconds. In that period of time, you should have collected at least 1 pint of fuel.

However, you should also be watching the pressure to make sure it remains relatively constant. If the pressure hesitates and spurts, the fuel pump will not be able to provide a constant pressure to the engine when it is running.

procrastilater
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