Odd Fuel deliery Problem
Thread Starter
|
Senior User
Joined: Oct 2009
Posts: 187
Likes: 0
From: Pontotoc, MS
Odd Fuel deliery Problem
I know there is air getting into the system, but I wondered if you guys ever had this problem.
If I leave my 86 6.9 Diesel on level ground I have no problems starting it in the morning no matter what the temp is.
But if I park at an angle, usually leaning hard to the right, it will start and run for maybe 10 seconds then die and is hell to start again.
I usually have to gie her a shot of ether to get her going again.
Over the weekend I ran the batteries down trying to get her cranked and ended up letting her roll abit til the nose was on a slight downhill grade. So I charged the batteries today and after a few spins she fired up.
The mechanics at work said I should just keep her level or the nose down...
Anyone every had anything like this happen?
If I leave my 86 6.9 Diesel on level ground I have no problems starting it in the morning no matter what the temp is.
But if I park at an angle, usually leaning hard to the right, it will start and run for maybe 10 seconds then die and is hell to start again.
I usually have to gie her a shot of ether to get her going again.
Over the weekend I ran the batteries down trying to get her cranked and ended up letting her roll abit til the nose was on a slight downhill grade. So I charged the batteries today and after a few spins she fired up.
The mechanics at work said I should just keep her level or the nose down...
Anyone every had anything like this happen?
Posting Guru
Joined: Aug 2009
Posts: 2,271
Likes: 2
From: Mexia, TX
Maybe leaning to the right allows air to form a bubble in the fuel system at the motor? I'm not familiar with diesels, but maybe having an air bubble in the system like that would create an air pocket and cause the pump to be unable to move fuel.
I can't stand it when people give suggestions like that. >_<
The mechanics at work said I should just keep her level or the nose down...
Moderator
Joined: Jan 2001
Posts: 56,949
Likes: 2,718
From: Virginia
That's what it is, your air problem.
I am sure you have played around with a straw in a drink before, and have held your thumb over the end of the straw and pulled the straw out of the drink, and the drink stays in the straw. That's exactly how the fuel system works on the diesels. When it's air tight, the fuel stays in the system. When you have a air leak, the air goes in and the fuel drains back to the tank.
What you are experiencing now is how much fuel is draining to the tank. If you park it with the nose up, the tanks are way lower than the fuel system, and a lot of the fuel drains back to the tank. If you park it nose down, the tanks are higher up in relation to the fuel system, so not so much fuel drains to the tank.
Fix your air leak and your problems should go away.
I am sure you have played around with a straw in a drink before, and have held your thumb over the end of the straw and pulled the straw out of the drink, and the drink stays in the straw. That's exactly how the fuel system works on the diesels. When it's air tight, the fuel stays in the system. When you have a air leak, the air goes in and the fuel drains back to the tank.
What you are experiencing now is how much fuel is draining to the tank. If you park it with the nose up, the tanks are way lower than the fuel system, and a lot of the fuel drains back to the tank. If you park it nose down, the tanks are higher up in relation to the fuel system, so not so much fuel drains to the tank.
Fix your air leak and your problems should go away.
Thread Starter
|
Senior User
Joined: Oct 2009
Posts: 187
Likes: 0
From: Pontotoc, MS
Would it most likely be that the fuel lines need to be replaced? This is my first diesel that I have had to work on by myself.
I am thinking that would be a good place to start.
I am thinking that would be a good place to start.
Moderator
Joined: Jan 2001
Posts: 56,949
Likes: 2,718
From: Virginia
The most likely culprit are the o-rings around the top of the injectors. Especially if it's a little damp around the injectors, or you have been messing around at the top of the engine and have disturbed the little caps and hoses that go from injector to injector. Also I believe on the older trucks(not sure about yours) they had a water seperator mounted on the firewall, and the seals in these like to leak also.
