Fuel pump
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Fuel pump - 5/23/2007 5:54:46 PM
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hummer333
Posts: 2
Joined: 5/23/2007
Status: offline
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I have a 2000 Cavalier that has just been quitting on me. Acts like it runs out of gas. I had the in line filter changed, but it is still doing this. Could it be the fuel pump? Has anyone replaces a fuel pump? Is it extremely difficult. I know it is in the gas tank. My husband is thinking about doing it himself. Any advice. Thanks
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RE: Fuel pump - 5/23/2007 8:04:34 PM
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ruffrider285
Posts: 95
Joined: 3/4/2007
Status: offline
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If it were the fuel pump, there is an access panel under the back seat. That will make it alot easier then taking off the fuel tank. It is an easy job. But i would check your fuel injectors first. Its cheaper.
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RE: Fuel pump - 5/23/2007 8:16:10 PM
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hummer333
Posts: 2
Joined: 5/23/2007
Status: offline
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Thanks, We have found if we bang on the bottom of the fuel tank, then the car starts! That makes us think that it may be either the fuel pump or a filter. Do all cavaliers have the access door under the back seat? Should the tank be drained first?
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RE: Fuel pump - 5/24/2007 8:07:05 PM
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ruffrider285
Posts: 95
Joined: 3/4/2007
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Well I would replace the fuel filter first, because thats only a $10 part. If that doesnt work the fuel pump is deff the problem. You shouldnt have to drain the tank, just make sure its not full. The pump sits at the top of the tank. And yes im pretty sure all the cavaliers have the access panel. It would be rediculous if we had to pull the tanks just to change a fuel pump.
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RE: Fuel pump - 5/25/2007 11:28:49 AM
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jlenko
Posts: 12
Joined: 5/25/2007
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I agree with ruffrider285, change the fuel filter first. It's a good thing to do anyway... just have lots of rags on hand to soak up the extra fuel.
Jack up the back of the car, the fuel filter is a round can in front of the rear axle. It's got a quick-disconnect fitting on one end (green clip comes out first) then the threaded end. The threaded end is usually a pain in the butt if nice and rusty, as they usually are after 5 or more years. Soak it in PB Blaster or another rust penetrant for a while before you try and crack it free. Use the right open-end box wrench on it... not an adjustable one, you WILL strip it out.... then you need to cut and splice lines which is not fun. When you take the filter out, drain it into a clear mason jar so you can see how dirty the filter was... it will probably drain out nice and black ;)
Oh, and go to a GM dealer and buy an OEM Delco fuel filter. Don't use the Fram garbage. Trust me :)
When diagnosing the fuel pump... when you first turn the key to ON (but not start), you should be able to hear the pump "prime" for 3 seconds or so and shut off. If you're not hearing that... then the pump is dead. These pumps don't come back from the dead... so if you're able to start it after a while, that's probably not the issue.
Oh, and BTW... there are no access panels on Cavaliers.... at least, not the third gen (95-05). Only the larger GM cars have an access panel. You do have to drop the tank... and it's a pain if there's more than a little fuel in it. It has to come out at an angle.... and the whole fuel assembly with sender and float are one component... you can't easily change JUST the pump. Unless you want to do a little upgrading for a high hp application, and are swapping the fuel pump itself for a Blazer or other high-flow pump... but that's beyond the scope of this post :)
Two more things to check... because I've had this happen to me too.... the fuse in the dash panel, and the relay under the hood. Check them both for corrosion on the terminals. Clean 'em up with a little steel wool and you might fix it :)
One more thing I forgot.... there's a recall in some areas for the level sender... it reads 1/4 tank when it's really at empty... some fuel additives can corrode the silver terminals on the level sender. I died on the highway with 1/4 tank... not good! I know it's a recall in BC and Ontario... not sure where else. A good reason not to use ANY fuel additives!!
...j
_____________________________
2000 Cavalier Z24 convertible w/ L67 swap in progress :)
From BC? Drive a GM vehicle? Check out the BC GM Enthusiasts forums -> forums.bcgme.ca
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RE: Fuel pump - 8/7/2007 11:31:21 AM
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garye
Posts: 8
Joined: 8/7/2007
Status: offline
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I am having the exact same problem but with my 95. I changed the fuel filter and fuel pump, which was a pain, but it still does the same thing. Drives great and then just quits. Wait awhile and it will drive great again for awhile and then just quits. What fuse did you check in the dash panel and what relay switch. I did not do that. Another suggestion came back to check the crank sensor. Know anything about that? My mechanic is even at a loss as to what to do.
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