PO174 With low fuel pressure

Hey folks, I have a 2006 dbl cab 4.7 with 352k on it. Think I've narrowed it down to the fuel pump or the fuel pressure regulator. The truck runs fine, no hesitation or stumbling.
Anyone else experience this before. Thanks

 

What's the fuel pressure at ?

it can happen, best way to check is to drive it with a gauge attached (tape to windshield) if it drops while driving it could cause that code.

 

The fuel pressure was 27psi

 

38-44 is spec.
If I remember correctly you can pull the vacuum from the regulator and it should max out if it can.
I'd guess a pump. Especially with that many miles!
Good luck

 

Thanks

 

At 352k on it, if you've never replaced the fuel pump, it's beyond its life expectancy. You really have two options: Buy aftermarket parts store bullshit that, if not DOA right out of the box, it may last you another 30-50k miles or 2-5 years. Or you can buy a Denso pump (which was the OEM manufacturer) and it'll likely last you another 200k-300k miles. Given the amount of work to drop the tank and swap the pump, I know which one I'd choose, since the risk of DOA these days is too high, and the cost of a Denso pump from a reputable source with verified inventory (don't buy on scAmazon/fleaBay) is maybe 20-50% higher at most? If that. even if it was 2x the cost, and it last 5x+ longer, and if it was Denso from the factory and that lasted 350k, seems like a no brainer.

Your truck, fortunately, is a later model, so no fuel filter to contend with. But yeah. I'd replace the fuel pump with genuine Denso brand. Look up the part number on www.densoautoparts.com their system is super easy

 

Thanks