Fuel pump wont come on when car is warm?? - Honda Civic Forum

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Fuel pump wont come on when car is warm??

Old 05-16-2014
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Unhappy Fuel pump wont come on when car is warm??

I have a 93 CX bubbleback with a b16a2 5 speed. It hasn't been happening below 10 degree celcius weather, but now as the warm weather is here my car is acting up again.. You know how the pump primes for 3 seconds or so when you turn the key to ON. When my engine is cool, it starts fine but when my engine is even just starting to get warm 1 of 3 times if i shut it off the pump wont come back on until the engine has cooled. It also happened when I put 91 octane instead of 87 like i usually do. I dont know if the computer is confused but I would really like to know how to fix this. It can be a real pain sometimes. Thanks yea also sometimes if comes on for a split second before i start it , then i shut it off and do it again and it'll come on longer then i try to start it and sometimes I am successful sometimes not.. Real pain
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Old 05-16-2014
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Re: Fuel pump wont come on when car is warm??

With a wire diagram and a voltmeter you could test to see if the PGMFI Main Relay might be at fault....

..or figure out if the ECM isn't turning the relay on when it should.
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Old 07-17-2014
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Re: Fuel pump wont come on when car is warm??

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