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How to flush fuel injection lines

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Apr 18, 2015, 5:53 PM

Post #1 of 3 (954 views)
How to flush fuel injection lines Sign In

2001 Cavalier Z24 2.4L

Hi Folks,

I'm looking for help on flushing old gas from the lines and tank, the car has been sitting for almost 4 years since she's run last.

Has anyone seen a DIY kit that uses compressed air hooked to the fuel line, something similar to the bleeding brake kits I`ve seen. Now being the car has a plasic tank would I have a drain plug?

Also on the fuel rail there's a screw, could a clear hose work using a vacuum compressor.

If I was to add premium fuel and run the car would everything be fine? I just haven't done anything like this ever.

any help on cleaning the lines would be greatSmile


(This post was edited by Kg14 on Apr 18, 2015, 6:26 PM)

Ultimate Carjunky / Moderator
Discretesignals profile image

Apr 18, 2015, 7:45 PM

Post #2 of 3 (938 views)
Re: How to flush fuel injection lines Sign In

I'm sure your going to have to remove the fuel tank and clean that out. Remove the tank and drain the old fuel from it. Wash the tank out with soap and water. Then let it sit out in the sun to dry. It is good possibility the fuel pump is going to be junk, so it would be wise to replace that.

Once the tank is cleaned out and a new pump with sock installed, connect the supply line, but leave the return line off the fuel pump module. Put the end of the return line into an empty gas can. Put some fuel in the tank and then power up the fuel pump. That should flush the lines and fuel rail out. Properly dispose of the contaminated fuel. Connect it all back together and replace the fuel filter. You should be good to go on the fuel delivery system.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Apr 18, 2015, 7:46 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 19, 2015, 12:14 AM

Post #3 of 3 (927 views)
Re: How to flush fuel injection lines Sign In

Old fuel anything. So hard to know for sure how trashed it is that easily. No drain plugs used that I'm familiar with to help.

Any chance of getting sample of fuel in clean glass to check it out first even from fuel filter's input side? That could tell how bad things really are.

Where did this sit for that long? That's going to matter all around for the car. Outdoors just sitting there will be quite a list things to do.

Just a thought on the fuel as there's so many blends you really don't know what you'll find. If real lousy check out how much a whole fuel tank is new, you may be surprised.

Other on junk fuel. One product seems to help break up remaining gels pretty good called by brand SeaFoam - read container but when all the fuel you can get out is gone I'd run just a bit of that thru. It doesn't run well on that - the idea is get that out as well and on to new fuel.

BTW - Premium fuel doesn't necessarily have any more additives or qualities than what it calls for just an "octane" rating. It costs more because it takes more "crude oil" to achieve that rating than lower ratings. Better? I can't say as fuel gets so messed with for locations and time of year. Note that no place calls it "Gasoline" by name!


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