Low Fuel pressure and code 171 and 174

[Marv02]

I have codes 171 and 174.

I changed out the MAF that's was bad no power when driving part of the problem with one from Auto Zone it ran good again.

Drove the car for a 60 or 70 miles and the codes came back Still have power still runs smooth.

Them I picked up Code 151, 171, and 171 so I replaced the Right side O2 I still have code 171 and code 174.

I did a Fuel pressure check and I getting 32 pounds of fuel pressure will this cause the code 171 and 174. It should get 50 to 60 Pounds of fuel pressure.

I changed out the Fuel pressure regulator same pressure 32 pounds.

About 3 months ago I put in a NEW GM A/C Delco fuel pump and a new fuel filter.

About 7 months ago I put new Knock senders and new Intake gaskets.

So will low pressure cause me these codes I don't want to put another new pump in to the Yukon but you got to fix right.

 

[Marv02]

I swapped out my New MAF with another new one same code.

I going to put another new intake gaskets in the morning I don't think this is it but I could be wrong I hope I am wrong.

I replaced them 8 months ago or so when the Knock senders went bad.

I would not think they go bad so soon.

 

[Marv02]

I should gone with my Gut feelings on this from the Get go it was the Fuel pump.

I wasted about $200.00 and hours of my time Chasing everything else others said was my issues from other sources.

If you throw these codes and it runs good idles smooth but no power check you're fuel pressure if low change the fuel filter But I knew my was new it is the fuel pump.

BUT my AC Delco E bay $30.00 fuel pump I put in about 3 months ago went bad new don't mean it good.

This time I went with a Auto Zone AC Delco complete new fuel pump assembly with a lifetime warranty for $245.00

 

[mattt]

Yeah...those "AC Delco" $30 ebay fuel pumps are NOT real AC Delco. Total fraudsters sell those. Tried one years ago, total POS that died within 3 months.

 

[Marv02]

Good Info for others

Lets pass this on DON"T buy AC Delco fuel pumps off of E bay mine also lasted about 3 months.

Yeah...those "AC Delco" $30 ebay fuel pumps are NOT real AC Delco. Total fraudsters sell those. Tried one years ago, total POS that died within 3 months.