Rough idle, difficult or no start, codes 0171 and 0174

BANJOBOB1200

MEMBER
1997 FORD MUSTANG
3.8L
V6
2WD
MANUAL
150,000 MILES

Car sat for 2 years. Started and ran fine initially. Threw a 0171/0174 code. Then started but shut off on acceleration and became hard to start. Acts like there's no gas. Aftermarket fuel pump installed about 4 years ago. Pump whirs about 1 second when ignition is turned on. Placed pressure gauge on fuel rail that showed zero pressure (fittings are wet but no pressure when removed). Installed gauge and fittings twice and repeated with no pressure. Is this a fuel pump? What else should I check? Also has brand new battery and 1/2 tank of gas.

Also replaced fuel filter with pump about 4 years ago. Removed filter and could blow freely through both ends. Reinstalled it.

5 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Most likely this is the fuel pump. Basically if you have no pressure at the rail then either the pump is not creating pressure or there is a restriction not allowing the pressure to get to the rail.

My bet is the pump has failed. If it were me, I would replace the pump.

I attached the process on how to replace this if you need it. Let me know if you need more assistance.

Thanks

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Thursday, June 11th, 2020 AT 5:32 PM

BANJOBOB1200

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23 POSTS

Thanks. I was leaning in that direction.

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Thursday, June 11th, 2020 AT 6:13 PM

KASEKENNY

MECHANIC
18,907 POSTS

Yeah. I think it is a safe bet on this one. Let us know how you make out or if you need more info. Thanks

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Friday, June 12th, 2020 AT 6:17 PM

BANJOBOB1200

MEMBER
23 POSTS

Agreed and replaced pump. Think the pump itself may have been ok but the intank hose looked very bad. May have just been recirculating most gas into tank. With new pump it fired right up; no hesitation on acceleration; didn't shut off after several minutes. Thanks. Now on to A/C!

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Wednesday, June 17th, 2020 AT 6:57 AM

KASEKENNY

MECHANIC
18,907 POSTS

Based on that, I am sure you are right. Glad you got it figured out. If you need help with the AC issue go ahead and get a new post started and we will help figure that out. Thanks for using 2CarPros.