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Topic Review (Newest First)
08-11-2014 07:00 AM
WrangledMike
Quote:
Originally Posted by boonew88 View Post
Jeep Wrangler 1989 Base. My fuel gauge is ALWAYS FULL even though i know the tank is empty. What are ALL possible reasons why this is? engine 258 6cyl. everything is stock. Just need my baby running once again. THANKS !!!! - boonew88

I would start with the gauge. If it like my boat, you should be able to ground out the lead to gauge, or test the resistance with an ohmmeter. Sorry, but thats as technical as I can get....I have no idea how to actually do either of those things. But good luck!
08-09-2014 04:10 AM
boonew88
FULL TANK? Faulty Gauge? idk HELP !!!! tnx

Jeep Wrangler 1989 Base. My fuel gauge is ALWAYS FULL even though i know the tank is empty. What are ALL possible reasons why this is? engine 258 6cyl. everything is stock. Just need my baby running once again. THANKS !!!! - boonew88
12-09-2010 10:14 PM
mholloway1809
Quote:
Originally Posted by Jmnem21 View Post
Do you happen to know where the sending unit is located?

So, if my guage is reading I have a quarter tank when I'm actually empty then what could the possible problems be?
I can only narrow it down to either a bad sending unit or the gauge. I just wanted to make sure there couldn't be another part that could go bad.
The sending unit is inside the fuel tank, its basically a variable resistor.
If the guage still shows 1/4 tank when empty then i would replace the sending unit as they fail after time.
12-06-2010 11:18 AM
Jmnem21
Quote:
Originally Posted by mholloway1809 View Post
The sending unit is a seperate componet from the fuel pump.
Do you happen to know where the sending unit is located?

So, if my guage is reading I have a quarter tank when I'm actually empty then what could the possible problems be?
I can only narrow it down to either a bad sending unit or the gauge. I just wanted to make sure there couldn't be another part that could go bad.
12-05-2010 01:14 PM
mholloway1809 The sending unit is a seperate componet from the fuel pump.
Never clean a fuel tank with a chemical cleaner, it will loosen years of rust and sediment and varnish which will get through the fuel filter to the engine and cause serious problems.
Just use a high quality detergent fuel and change the filter often.
12-05-2010 12:58 PM
Jmnem21 Took out the tank Thursday night to replace the pump and realized I had no gas in the tank all along. my gauge was reading that I still had a quarter tank left but I was getting no fuel pressure to the engine. Go figure, I just had no gas. The worst part was I had the Jeep towed from a gas station. You live and you learn!

Does anyone know if the gauge is reading incorrectly, could it still be that the fuel pump is sending the information to the gauge incorrectly or is there a different sending unit on the Jeep?
12-01-2010 07:50 PM
jeepjohnson
Quote:
Originally Posted by Jmnem21 View Post
I have a 91 YJ V6 and it started acting up on me last night. We checked the fuel pressure and it was 5 lbs. I had a shop look at it and they said it was my fuel pump and they would charge me $400 to fix it. I didn't believe them at the time so I changed the fuel filter and that did nothing. So, tonight I'm changing the fuel pump.

One of my friends told me I should clean out the tank along with the replacing the pump. Any advice on proper methods or chemicals to use to clean it out?
I had the same problem, here is what my fuel pump strainer looked like when I pulled it out of the tank. I just used a little clean gas and some rags to clean the tank out before I put the new pump and strainer back in. Good luck with the repair.









12-01-2010 10:58 AM
Jmnem21 It is a stock inline 6. Thanks for the advice, VHunter. Just wanted to make sure I didn't need to do anything specific (with chemicals) to it.
12-01-2010 10:26 AM
VHunter Is it a stock engine since they only had an inline 6 or a four cylinder that year?

When you drop your tank and pull out the fuel filter look inside the tank, most likely you'll find out it is just fine. If you do decide to wash it out just use soap(dishsoap) and water, just make sure to get all the soap out and let it dry completely before putting it back together. Remember if you clean the tank and leave chemicals or water behind you are going to cause more problems than you would solve.
12-01-2010 07:53 AM
Jmnem21
Fuel Tank Cleaning

I have a 91 YJ V6 and it started acting up on me last night. We checked the fuel pressure and it was 5 lbs. I had a shop look at it and they said it was my fuel pump and they would charge me $400 to fix it. I didn't believe them at the time so I changed the fuel filter and that did nothing. So, tonight I'm changing the fuel pump.

One of my friends told me I should clean out the tank along with the replacing the pump. Any advice on proper methods or chemicals to use to clean it out?

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