84 CJ-7 Fuel System - JeepForum.com
 
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post #1 of 7 Old 10-26-2021, 07:55 PM Thread Starter
wst
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84 CJ-7 Fuel System

I have a 1984 CJ-7 with 6 cyl. I replaced the gas tank along with the rubber fuel and return lines that were attached to the tank. Was running fine the first day I drove it. Next day it occasionally would stall out. Do I need to bleed the fuel lines?
Thanks.

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post #2 of 7 Old 10-26-2021, 08:01 PM
fibersport
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Never heard of having to bleed fuel lines. The float bowl in the carb would prevent any issues with air until you just ran out of gas. Is the fuel filter oriented correctly? I've heard that if it's not correct, it can allow gas to siphon back to the tank.

1984 CJ7 Renegade
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post #3 of 7 Old 10-26-2021, 08:22 PM Thread Starter
wst
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Have not replaced or checked fuel filter. I didn't do anything to that end of fuel systems so was thinking it may have something to do with back end.
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post #4 of 7 Old 10-26-2021, 10:04 PM
JEEPFELLER
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1) Before you done anything, was it driving fine?

2) Is it possible that you have a crimped (new rubber line) Maybe it was wanting to bend over on Day 1, then with temperature/ etc. it did crimp over?

3) Maybe something dislodged and now stuck further forward?

4) Maybe the rubber line on the suction side of the pump has a hole/ crack in it?

You can disconnect that line and replace it with a 6 foot or so Test Fuel line and stick the end in a Gas Can.....or just replace it anyway?

5) Maybe the fuel filter is full of trash you stirred up?

6) Bad fuel pump----lets test 1st!!!!

7) Maybe the filter in the fuel tank is stopped up-----prior to "Going In", you might shoot some compressed air into the fitting at the tank---TAKE OFF YOUR FUEL CAP 1st!!!!-----one side is "fuel out" the other is the return line. If the air helps the issue, you still might have to remove the tank and sending unit and clean both up to remove any trash.

8) Test----this will work and be a positive result----as long as everything prior to it is functional

This is from a '77 factory manual, it works for all.

-----JEEPFELLER
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post #5 of 7 Old 10-27-2021, 04:38 AM
keith460
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Check your venting and return fuel lines. Make sure they are in the correct order and are functioning as intended.

Attachment 4014727
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post #6 of 7 Old 10-27-2021, 05:00 AM
John Strenk
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Did you use rubber lines designed for fuel?

Also, did you install the fuel sock/filter on the bottom of the pickup?


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post #7 of 7 Old 10-27-2021, 06:19 PM
JEEPFELLER
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I had a little 4 stroke 1.2 HP boat motor from Sears.

Got it as a gift when I was about 16.

I was in such a hurry to use it, I missed the part about the vent screw on top of the gas cap.

Stuck it on my little John boat, boarded my buddy and suddenly became "PT 109"

It got me a good ways down the river then it quit, I pulled the rope until I had blisters between my fingers.

Then I decide to check my fuel level, cap off, nearly full!

One pull and it fired right up!

Then it done it again.

My friend was holding the fuel cap this time while I checked the level. (this gave it a gasp of air, like before)

He announced that the little gear looking thingee on top actually screwed upward and we finally figured out it was a vent.

If I am shooting you good info, before you start fixing stuff with the vents, remove your gas cap temporarily and see if it will now drive (without creating a suction/ vacuum in the tank).

This might verify if the venting is the issue.

Just a thought---won't hurt nothing!

----JEEPFELLER
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