I have a 2003 Ford Explorer Limited V6 Non flex fuel. 1st symptom was, when the temp went down the harder the car was to start (start as in, turn key, battery comes on, it turns as in cranking, just wont catch). It would take 3 - 25 million times to start. If the temp was below 32 it would not start at all, over 75 only took twice. Once the car started, it would stall out. After that, it ran great, no other issues started frist time, until the engine got cold again. Had it diagnosed, the mechanic said, it was the fuel pump, it was to weak to build up the pressure needed when it was cold, so it had to build it up and that is why it ran great. Once pressure was gone, was when I had trouble again. Vacuum lines were checked no issues.
Had changed, fuel filer, fuel pump, spark plugs and wires, battery and MAF sensor. Fuel pump was the last thing to get changed out. With the other things listed, it did not improve.
After the fuel pump (last thing installed) was installed it wont start 1st time, (as in it cranks over, but wont catch). Second time starts right up. No more stalling. Now the 1st no start is consistent. I can run it for a half an hour, pump gas and it wont start 1st try. 2nd try no issue.
I have tried turning the key on to let the pressure build and try starting, Nope. Has to have the key turned off again and try to start again. No more stalling issues.
Any idea what this could be. I am mad at my mechanic right now (don’t want to go into how they wanted me to drive it back to the shop, and made me pay for a fill up afterwards, and more). After I picked up my car. It was reading 0 miles to E, on the tank. I went to the gas station to fill up… Splash, the gas went right out again… I was told it was “Simple Human Error”. The mechanic got called away and forgot to attach the fuel line, before he reattached it.
Could this "Simple Human Error’ incident caused any issues to fuel pump. They want me to pay another diagnostic fee to further see what the issue is. Could it be the fuel relay sensor (it did click when my husband checked) or the Main relay? Or something larger.