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Old 01-08-2022, 06:09 AM   #1
Mini-Skoolie
 
Join Date: Oct 2020
Posts: 10
Bus won't accept fuel

Hey Guys,
Hope someone has a clue about what's going on with my bus I have a 2000 GMC 6.9l Thomas Built shorty.
Great bus with low miles BUT I can't get it to accept fuel. If I fuel really slowly (like 20 minutes per gallon) I can get some fuel in. Otherwise fuel just backs up and runs down the outside of the bus. I have run out of gas in the past thinking tank was full. Obviously, fuel gage unreliable. Bus is fine mechanically and I'm ready to get on the road but gotta solve this first. Any help appreciated.
Thanks

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Old 01-08-2022, 09:35 AM   #2
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Year: 1999
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Quote:
Originally Posted by Mamassecret View Post
Hey Guys,
Hope someone has a clue about what's going on with my bus I have a 2000 GMC 6.9l Thomas Built shorty.
Great bus with low miles BUT I can't get it to accept fuel. If I fuel really slowly (like 20 minutes per gallon) I can get some fuel in. Otherwise fuel just backs up and runs down the outside of the bus. I have run out of gas in the past thinking tank was full. Obviously, fuel gage unreliable. Bus is fine mechanically and I'm ready to get on the road but gotta solve this first. Any help appreciated.
Thanks
Go underneath the bus and check to see if your fuel inlet hose is kinked. There should be a second skinnnier hose next to it. That is a vent hose. Check that one too. If it does nor vent while filling the big hose will get blocked by the air trying to leave the tank.
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Old 01-08-2022, 11:58 AM   #3
Mini-Skoolie
 
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Rated Cap: 5 window
Make sure the key is off, so the vent valve is open. You need vapors to escape when filling. There is also a limiting valve built into the tank, I have not seen issues with this valve. If the charcoal canister is restricted, this can be the issue.

Make sure the fumes can be released thru the canister to allow fuel to enter the tank.
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Old 01-08-2022, 09:52 PM   #4
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The OP also asked me this question on our YouTube channel and, based on what was described, I am pretty sure that the fill tube is either kinked or plugged...perhaps by some malicious trash disposal...I picture some kid's empty chip back in there? I did mention the vent, but based on what she's describing it sounds like a more serious blockage than back pressure from a venting issue.
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Old 01-09-2022, 08:15 AM   #5
Mini-Skoolie
 
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Thanks. We will try it.
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Old 01-09-2022, 08:17 AM   #6
Mini-Skoolie
 
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Thank you for your input. We are on it.
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Old 01-13-2022, 09:24 AM   #7
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Maybe the anti siphon valve is stuck in the tank? I had this happen to me in my van.


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Old 01-13-2022, 09:51 PM   #8
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Quote:
Originally Posted by Mamassecret View Post
Hey Guys,
Hope someone has a clue about what's going on with my bus I have a 2000 GMC 6.9l Thomas Built shorty.
Great bus with low miles BUT I can't get it to accept fuel. If I fuel really slowly (like 20 minutes per gallon) I can get some fuel in. Otherwise fuel just backs up and runs down the outside of the bus. I have run out of gas in the past thinking tank was full. Obviously, fuel gage unreliable. Bus is fine mechanically and I'm ready to get on the road but gotta solve this first. Any help appreciated.
Thanks



What kind of fuel, gas or diesel (I don't know what a GMC 6.9l is)? How do you know that it needs fuel? I have no experience with diesel, but I have bad fuel pumps and clogged fuel filters make it seem like I was out of fuel on gassers in the past.
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Old 01-14-2022, 12:07 AM   #9
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So many bogus potential causes mentioned....WOW


Charcoal canister? yeah.....NOT


Most likely issue is kinked or blocked (chip bag?) fill tube or hose OR..... a vent hose that has a low spot in it that is full of fuel and thus doesn't allow venting.

The vent tube blocked won't PREVENT fuel from flowing to the tank but it will dramatically slow down how much can get in.


A flashlight, wire probe, and visual inspection should be all that's needed to determine for sure what's wrong.
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Old 01-14-2022, 02:19 PM   #10
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2000 gmc shorty.
if it is a cutaway savana/express then a collapsed hose is a definite possibility.
on my 04 3500 express the fuel tank is in the middle between the frame rails and the fill tube is kind of sandwiched between the top of the frame rail and the bus body which egg shapes it to begin with.
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Old 01-14-2022, 02:45 PM   #11
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Added fuel conditioner to my car and didn't take the foil covered paper protector off, just poked it with a key and poured it in the tank.

Didn't notice it had come off while pouring it in the tank, and when I went to fill up the tank it did exactly what you are describing!
The anti siphon valve was stuck from the debris coming off the fuel additive bottle, preventing full flow of fuel into the tank.

Have you or anyone you know put additive in the tank lately?
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Old 01-14-2022, 02:56 PM   #12
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we still dont know exactly what fuel system they have.
the stated 6.9 was actually an international/ford motor that didnt make it into the year 2000.
if it diesel then it is a 6.5
if it is gas its an early version 6.0 ls
fuel type decides the safeties built into it and yes even including the tank fill
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Old 01-14-2022, 03:12 PM   #13
Bus Crazy
 
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Those rescue cold weather diesel fuel additives have the foil protector on them too so it can be either fuel type, potentially.

If I had to guess, she most likely has the gas 6.0 engine option.

I feel embarrassed admitting something like that on the www, but if it helps someone else in diagnosing an issue, it was worth the embarrassment!
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Old 01-14-2022, 03:16 PM   #14
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Quote:
Originally Posted by Jolly Roger bus 223 View Post
we still dont know exactly what fuel system they have.
the stated 6.9 was actually an international/ford motor that didnt make it into the year 2000.
if it diesel then it is a 6.5
if it is gas its an early version 6.0 ls
fuel type decides the safeties built into it and yes even including the tank fill
We also don't know if she is adding fuel at a gas station on level ground or from a gas can on level ground and if using a gas can is she pouring or using a pump (does the pump have a auto shut off?). How can you get a gas pump at a gas station to allow you 20 minutes to put in a gallon of fuel? The built in fuel shutoff and timers won't allow that kind of fueling but a gas can will.



The people replying have been making all kinds of assumptions and the op has not been forth coming with answers to questions. My bs meter was going off, which was the reason for my first post with questions. Waste of time.
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Old 01-14-2022, 03:25 PM   #15
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yes they do and i wasnt trying to balk on you.
yes over my many years of mechanic work i have done some stupid stuff more from being in a hurry or getting distracted or pulled away before finishing a specific task.
it happens.
i have a motor i rebuilt 6-7 years ago that has a flat head screw driver bit in the oil pan
from not having a long enough screw driver to turn the oil pump rod to set a new distributor.
only reason i didnt take it out of the truck and tear the hole thing back apart is because i heard it hit the oil pan.
thought no way i got that lucky?
put a magnet on the oil pan and i can move it around but for the life of me i cant get it out of the drain hole.
sorry long story short?
not all fuel tanks have the anti siphon valve.
i have learned alot from my own mistakes over the years and only remember some of them when i get into that situation again?
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