rhino7628

Had fuel pump and filter replaced 2 days ago. Now the Service Engine Soon light is coming on. Autozone read code P0440. My obvious suspicion is it is something that Pep Boys did or didn't do when replacing the fuel pump. Any ideas what that might be?

Blue Bowtie

Welcome Aboard!

P0440 Evaporative Emission Control System Malfunction

The EVAP canister and canister purge control solenoid are frequently mounted under the vehicle, and the vapor hose from the fuel tank routes to the canister. It is possible that a hose was inadvertently left off, or not connected well after the tank was installed, or that the EVAP Purge solenoid connector was left off or dislodged while removing or installing the fuel tank.

It could also be coincidental, but it certainly seems suspicious.

mike2004tct

When I replaced my pump, I had a bad pinch fitting on the outlet hose that caused a similar problem.
Probably a loose connection back at the tank. Can you smell raw gas around the tank/rear end of the truck?

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Cloud Strife

Just a thought. Did you have them replace the wiring harness too?

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1999 Blazer 4x4 LS "Blackie"
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DelCoch

I agree it's probably a vapor hose from the fuel tank that goes to the canister. There is one on each end of the tank and when lowering the tank the one on the front end of the tank is usually forgotten about, (not disconnected) and it breaks of the nipple on the little plastic valve the hose connects to.

Whether you can get Pep Boys to admit fault or not will be another story.

Check out this thread for photos

rhino7628

OK, Pep Boys fixed it under the 90 day warranty on service and parts. They said that when the other Pep Boys in Pennsylvania replaced it, they mangled a gasket, causing a vapor (thus pressure) leak.

So it's been 3 days since they completed this repair and there is another problem now with the fuel gauge always staying on full. I'll post in a new thread since it is a different issue.

mike2004tct

Actually, it's related to what Pep Boys did. The fuel level sensor is on the pump assembly. Sounds like you need to head back to the Boys.

Usually if the gauge stays at full, there's no power to it. The knuckleheads probably didn't re-connect the gauge connector when they re-assembled the unit (I did it to my daughter's car, so I know it can happen).
Either that, or they bent the level rod, but I'd guess no power connection being made at the pump for the gauge.

__________________
It's my opinion, don't take it personal.
'04 T&C, '97 Blazer, '97 Sunfire, '85 Vette, '79 Civic, 94 FLSTC