Question about 2006 Ford Focus
Now your saying, temp is below 40 F, and you have crank but no start. If you play with ignition switch the pump turns on.
Not likelyto be a fuel pump on a 4 year old car.Unless you have 100K or better on the vehicle and like to drive it on empty (E) the pump is not your culprit.
Sounds more like a cold start /enrichment problem.
I recommend first scanning the ECU for codes and taking it from there. If there are no codes then i would testing coolant temperature sensor because the ECU relies on this sensor to increse fuel volume or decrease it depending on coolant temperature during warm up. It also uses an air temperature sensor in the mass airflow sensor for part of the same reason.
Before you spend a fortune on a fuel pump, couple more test I like to see. Ignition switch, fuel pump relay and the pump for residual pressure as well as volume. Normally I would say ignition switch based on your write up. Its the below 40f thats getting me to think about other items. keep me posted.
Posted on Apr 26, 2010
Testimonial: "I have changed all relay switches,and now when the temp is in the 50 it doesn't want to start. if you turn the switch on and leave it for 2 min it wil"
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Posted on Jan 02, 2017
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