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Got into a customer's '99 Volvo V70 yesterday. Throwing the P0171 code (lean bank 1), some bogging, and only 22 psi on the rail (should be 45). Everything points to the fuel pump assembly.
It's very easy to get the fuel pump out (remove cover over an 8" hole & there you are).
Turns out the pump itself is fine. There are two tiny splits in the hose that attaches the pump to the module assembly. Obviously that's causing the low rail pressure, as well as the bleed-back when the car sits. The pump was replaced 20k miles ago, with a Volvo OEM pump.
I explained it to him, and gave the customer two options:
1. Replace the fuel line with a new 4" piece of line, and two new clamps. Reassemble & go.
2. Go ahead and replace the pump while we're in there. There are several pump options available.
Cost:
Option 1. $75 labor. No warranty.
Option 2. $75 labor, plus $400 for Volvo OEM Pump Assembly. One year warranty.
Option 2a. $75 labor, plus $150 for an Airtex Pump. Limited lifetime warranty.
So you're the customer. You can choose to spend $75, $475, or $225. Which do you choose?
Probably 2a? Although at the price of Option 1, you could do it several times before paying for option 2. For a car that's that old, I'd probably not go for 2, but I am a bit of a sucker for keeping my car happy, so I'd probably at least go for 2? Not sure.
(full disclosure is I don't know much about cars and even less about volvos, being a prius driver)
'99? Option 1. Car's too old and the pump is already new. From your description, you seem confident the line is the problem.
Of course, if you happen to know something about these Volvo pumps failing over and over, then perhaps you go ahead with another pump. But a pump should last a long time generally I would have thought.
I agree with most and considering it is a 14yr old car, I would go with option 1
...but it's in pristine condition. Seriously. Not a scratch, dent, speck of rust. New tires. "Best of Kansas" sounds awesome on the stereo.
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