Cel 0455

**wallyd** · 07-31-2013

I can't get this code to go away.

I've replaced:
- Fuel pump (blown after 3 weeks of owning the car. I have checked and it's sealed properly. I used the rubber gasket and all that)
- EVAP canister
- Purge Valve
and now the gas cap, which didn't do anything.

All AC Delco parts, bought off either amazon or at a GM parts center. I got it "smoke tested" when the code first came up, and they didn't find any leaks. I'm completely lost as to where to look now. The dealership I bought it from a few months ago is of absolutely no help in finding it, and wanted to charge me nearly $400 to replace the EVAP canister, which is a joke.

I did notice that when replacing the purge valve on the engine, the vacuum line doesn't really "snap on", it just kind of slides on.. is this how they are supposed to be connected? I feel like that would be faulty, just by looking at it and assuming it would be pulling vacuum. Could it be the EGR valve? Or would that throw a different code? It looks pretty ****ty right now, definitely seen some miles.

All of the searching I've done has basically lead to the same answers. Replace gas cap, replace purge valve, then canister.. etc. I've done all of that, sadly.

Thanks in advance

**02NavyBlue** · 08-06-2013

Any updates? I'd say check all lines from the gas tank, all the way to the purge valve and to the intake. This includes metal lines on the underside of the car. They could be rusted and have a hole on top that you may not see.

The connections do just slide on. If all connections and lines really look good, I'd recheck the gasket area on the fuel tank.

**BillBoost37** · 08-06-2013

What is 455?

**Scottydoggs** · 08-06-2013

large evap leak bill. OBD-II Trouble Code: P0455 Evaporative Emission Control System Leak Detected (no purge flow or large leak) hes got a bad hose somewhere id think.

**wallyd** · 08-09-2013

Sorry about not updating, been busy putting headers on my actual project car lol..

Anyway, the other night something weird occurred - my "average mpg" on the DIC started jumping around like crazy. It used to be stuck on 16.4 mpg, but after it jumped around for about a half hour drive it began to steady out. After taking the car to my girl's who lives 40 min away, it displayed 17.5 for an average! I've never seen it higher than 16.5 - any ideas why that would occur? For ****s and giggles i cleared the code, but I plan on re-checking my lines Tuesday after I get finished with the headers on my other car. Will post back again.

Thanks guys

**94grandprix** · 08-09-2013

Mine says around 26.5 and mines the gtp

**wallyd** · 08-10-2013

What year? I dont drive the highway much, and mostly romp on it around town. I haven't been lately and almost got 19 mpg

**94grandprix** · 08-10-2013

00 and I tend to get on it a little lol but when I first put has in it goes up to almost 38 but goes down as you drive,it seems to get better mileage than the 03 gp se we got

**94grandprix** · 08-10-2013

I don't never get on the highway the max trip is prolly 45 miles once on the interstate and then other is small trips

**94grandprix** · 08-10-2013

Is it possible for the fuel pump to be stuck on high instead of lo??

**94grandprix** · 08-10-2013

My fuel pump o ring somehow slid out of wack so my fuel pump isn't fully sealed,found out after I smelt gas strong going down the road

**Scottydoggs** · 08-10-2013

thats called a do over, use some grease to hold the O ring in place.

**94grandprix** · 08-10-2013

I was recommended Vaseline,it wouldn't go for anything,pushed so hard it made my finger sore for days,I'm retrying it when I run the gas a little lower incase it's in the tank

**Scottydoggs** · 08-10-2013

same thing at the end of the day. either will work.

**wallyd** · 08-11-2013

I put the o ring on the pump and carefully put the pump in. The hardest part was the snap ring, which was done via some "persuasion" with a rubber mallet and careful taps with a screwdriver. Just put the handle side against one of the small round tower-like pieces, then hit the tip with the mallet. That way you wont blow yourself up lol

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