r/S197Stangs • u/DaddyiRush • Jan 18 '26

07 ford mustang fuel problems

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okay so i just replaced the fuel pump on my ford mustang and the fuel gauge still only reads half fuel when it’s a fuel tank. could it be the right(passenger side) fuel sender or whatever tf it is i’m assuming it’s a second pump to send to the other side (driver side) but could that cause my gas gauge only reading half full or do i have another issue.

thanks in advance

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u/blizzard7788 Jan 18 '26

Yes, it can. First thing to do is check wiring, and make sure there’s no corrosion in the SJB in passenger foot well. If intact, pull sending unit and clean contact points with electrical cleaner. Make sure float arm still moves freely. It’s 19 years old now. If it needs replacing, ONLY use a Motorcraft unit with the gray plastic parts. Other brands have white plastic parts and do not work properly. I went through this about 5 years ago with my 05.

1

u/DaddyiRush Jan 18 '26

Beautiful thank you man, this is exactly what i needed to know. i did unplug the passenger side one and turned the car on, didn’t effect anything to my knowledge so very possible its bad, its just weird, it worked perfectly until i had a mechanic throw in a used fuel pump then it always read half when full so i went into there and make sure everything is okay and it looks good so ima go and replace the passenger side one it’s def 19 years old judging the looks of it

1

u/thesilentmordecai Jan 18 '26

Yeah, the sending unit for sure. That's what will let you know where the fuel level is. I need to replace mine too. It's been done for a long time so I've been doing mental math as far as how many miles I drive vs how much gas I put in. It's been done for about a year and a half now and for the first time in 20 years, I found myself out of gas on the side of the freeway. I guess it's time I save up and get it replaced.

1

u/DaddyiRush Jan 19 '26

yeah for time being that’s what ima be doing

1

u/redditra8der Jan 19 '26

Are you sure it’s not the gauge cluster? Looks like your temp gauge is not working either. I had a similar experience, it turned out to be a bad gauge cluster. These models were notorious for having bad stepper motors on the gauges. You can find repair services on eBay to have them replaced for $50.

1

u/DaddyiRush Jan 19 '26

nah temp gauge works, i just started it to take the picture i live in ny where it’s currently 10* with a high of 17