fuel pump test question
#1
fuel pump test question
i need to test my fuel pump and want to give it voltage directly, but without taking it out yet, anyone know the leads on the fuel pump plug that I need to give voltage to?
the manual lables the leads a,b,c,d...with a,b, on the bottom, and c,d on the top...d above a and c above b
so like this if you are looking in the plug...
d - c
a - b
This is the plug on the tank, not going to the tank.
the manual lables the leads a,b,c,d...with a,b, on the bottom, and c,d on the top...d above a and c above b
so like this if you are looking in the plug...
d - c
a - b
This is the plug on the tank, not going to the tank.
#4
thanks cavellm, i read your thread about your pump going south... did you get it all fixed up?
https://www.rx7club.com/forum/showth...5&pagenumber=2
https://www.rx7club.com/forum/showth...5&pagenumber=2
#6
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Unfortunately not. It ran last night after unplugging and plugging back in the connector on the bottom side of the tank cover. Unflooded it and boom, ran for 20 minutes. Started and stopped it twice more.
Changed my oil, then combusted a little but died a few seconds later.
This morning tried unflooding it with no success. Took out the pump yet again and found its not getting power again. I can trace the power to the bottom side harness on the cover, but not to the terminals. Fucked up thing is its the same on two different fuel pump assemblies.
Changed my oil, then combusted a little but died a few seconds later.
This morning tried unflooding it with no success. Took out the pump yet again and found its not getting power again. I can trace the power to the bottom side harness on the cover, but not to the terminals. Fucked up thing is its the same on two different fuel pump assemblies.
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#10
decided to put it all back together since the pump was pushing fuel....
re-installed a plug I had out for testing, put pukmp connectors back and .... started right up ...
hehehe, these machines are an enigma
im guess a plug got loose and I re-attached it during testing...who knows....
re-installed a plug I had out for testing, put pukmp connectors back and .... started right up ...
hehehe, these machines are an enigma
im guess a plug got loose and I re-attached it during testing...who knows....
#13
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I am not a Mazda expert, but I am a fuel injection expert.
I didn't read the hole set of threads real close, however this is a fuel injected engine and the injectors must be pulsed by the engine computer. No pulse no fuel. Since you are getting spark this tells us the crank sensor is sending a signal up to the ignition system but since I don't know Mazda I can't say how the chain of events transpires. Most cars I have worked on will have spark even if the engine computer is unplugged, so this may not be a fuel pump issue. Normally the injectors are powered up and the engine computer grounds the circuit so connecting a test light in place of one of the injectors would tell you if a signal is being transfered.
I didn't read the hole set of threads real close, however this is a fuel injected engine and the injectors must be pulsed by the engine computer. No pulse no fuel. Since you are getting spark this tells us the crank sensor is sending a signal up to the ignition system but since I don't know Mazda I can't say how the chain of events transpires. Most cars I have worked on will have spark even if the engine computer is unplugged, so this may not be a fuel pump issue. Normally the injectors are powered up and the engine computer grounds the circuit so connecting a test light in place of one of the injectors would tell you if a signal is being transfered.
#14
/\ what ever you do do not put a test light anywhere near the fuel injectors. it is a bad idea even if it is a high impedence snap on one. use a noid. who wants to be the one guy whos ecu gets burned
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