Fuel Tank Problems
Thread Starter
|
New User
Joined: Jun 2018
Posts: 7
Likes: 0
From: Sydney, Australia
Fuel Tank Problems
So I emptied the fuel tank on my 69 F100 before replacing all of the lines and the fuel pump. Reason being is that my truck on a number of occasions would stop after spluttering to a halt. Thinking that it was either a pump or carb problem, I replaced the pump first.Once the tank was emptied, I put 10 litres of fuel back in as the contents of the tank seemed pretty clean. Connected every thing back up and attempted to start the truck with no success.Disconnected the line under the tank and no fuel came out. I stuck a piece of wire through the outlet back into the tank and still nothing came out. I did this a number of times. Next step was to blow into the tank from the inlet at the top, with that fuel came flowing out the bottom.I then blew compressed air back up into an empty tank to clear anything that might be blocking the line. Filled it up again and still no fuel would come out. I then blew into the tank from the inlet at the top, with that fuel came flowing out the bottom again.The float is missing off the sender, which I found yesterday but I don’t think that this could be blocking the hole.Any suggestions of what the problem might be.
Logistics Pro
Joined: Aug 2015
Posts: 4,093
Likes: 14
From: Lind, WA- Eastern WA
Sounds like some type of sediment is in the outlet. I would drain the tank and flush it out. Then check the outlet with an air compressor blow gun. Also make sure that the rubber hoses underneath the cab are in good shape. A small crack will allow air to get sucked into the rubber fuel line and the fuel pump won't be able to fill the carb with gas.
Thread Starter
|
New User
Joined: Jun 2018
Posts: 7
Likes: 0
From: Sydney, Australia
Thanks Gary,
I found this last night. See picture below. The fuel exits the tank from the top not the bottom.
I think that this set up is like when you try and drain a pool with a garden hose, same principal. The cap seems a little loose, but i think that allows the tank to breath.
Truck seems to be working much better now, still a little concerned that it may have problems happen again.
I found this last night. See picture below. The fuel exits the tank from the top not the bottom.
I think that this set up is like when you try and drain a pool with a garden hose, same principal. The cap seems a little loose, but i think that allows the tank to breath.
Truck seems to be working much better now, still a little concerned that it may have problems happen again.
Senior User
Joined: Jun 2018
Posts: 207
Likes: 1
Are you saying that when the gas cap is left a little loose the gas tank and pump work fine, but if you tighten the gas cap up it runs and then dies after a few minutes, if this is so you need a vented gas cap. This is the same with corvettes.
Thread Starter
|
New User
Joined: Jun 2018
Posts: 7
Likes: 0
From: Sydney, Australia
No cap is original and is vented, so I don't think that is the problem. May be it was a weak pump (now replaced). I was just surprised that the tank exit was at the top of the tank.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Trending Topics
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
The outlet is at the top so it is harder to pick up sediment in the bottom of the tank. Since it can't use gravity the pump has to suck the gas out. So both rubber hoses have to be in good shape. Otherwise they might allow air to pass. So the pump will be sucking that air and not gas. This happened to my Bump. And others on this forum. So I suggest replacing all the rubber hoses you have tank to carb. Cheap insurance.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
New User
Joined: Jun 2018
Posts: 7
Likes: 0
From: Sydney, Australia
So the fun never stops. Great weekend last weekend, 2 days of driving no problems. I go to start the truck on Sunday morning and nothing, very little fuel in the the top fuel filter at all.
Keep in mind this is with a brand new pump and replacement of all the rubber fuel lines. I did have the sender off on Saturday, but i don't think that this would make a difference. Even went to the extent of blowing into the tank to push the fuel through, (which has worked before) still no good.
The sender is not working and the float seams to have disintegrated, so presumably there will be parts still left ion the tank.
Thoughts?
Keep in mind this is with a brand new pump and replacement of all the rubber fuel lines. I did have the sender off on Saturday, but i don't think that this would make a difference. Even went to the extent of blowing into the tank to push the fuel through, (which has worked before) still no good.
The sender is not working and the float seams to have disintegrated, so presumably there will be parts still left ion the tank.
Thoughts?
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
So the fun never stops. Great weekend last weekend, 2 days of driving no problems. I go to start the truck on Sunday morning and nothing, very little fuel in the the top fuel filter at all.
Keep in mind this is with a brand new pump and replacement of all the rubber fuel lines. I did have the sender off on Saturday, but i don't think that this would make a difference. Even went to the extent of blowing into the tank to push the fuel through, (which has worked before) still no good.
The sender is not working and the float seams to have disintegrated, so presumably there will be parts still left ion the tank.
Thoughts?
Keep in mind this is with a brand new pump and replacement of all the rubber fuel lines. I did have the sender off on Saturday, but i don't think that this would make a difference. Even went to the extent of blowing into the tank to push the fuel through, (which has worked before) still no good.
The sender is not working and the float seams to have disintegrated, so presumably there will be parts still left ion the tank.
Thoughts?
Thread
Thread Starter
Forum
Replies
Last Post
BossFan
Fuel Injection, Carburetion & Fuel System
4
Aug 20, 2011 07:36 PM
coreyp
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
4
Sep 29, 2010 08:51 AM
cwhitehurst
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
7
Mar 7, 2008 07:48 AM