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Old 03-06-2018, 06:51 PM   #1
Marchalis
 
Drives: Yaris yrs 2006
Join Date: Mar 2018
Location: Australia
Posts: 7
electrical question: Ground problem?

Hi,
I have a car fuel pump no start problem.

test 1
The fuel pump in the yaris gets its negative/ground from the back of the cars body, and the positive goes to the dash. In this configuration the car won't start despite getting 12v through on startup from the plug attached to the fuel pump.


test 2
The fuel pump works with direct connection to a battery, negative and positive Direct from battery. proper pressure.


test 3
While Directly connecting the 'positive fuel pump wire', to the battery. but still drawing negative from the car body as usual, also no start, fuel pump doesn't pump. Zero fuel pressure.


test 4
negative/Ground from the back of the car is producing 12 volts,
Testing for spark from the negative/ground from the back of the car to the positive battery terminal, suggest that it's getting enough amps but I feel dubious about the assessment there. (I have no way really of testing for amps

I'm suspecting a ground problem but I might be missing something?



Cheers for any clues
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Tags
electrical, fuel pump, ground, no start

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