fuel leak?
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Junior User
Joined: Aug 2010
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From: antioch ca
fuel leak?
My gas mileage in my 00 f250 seemed a little crappy the last couple of months I started with the boots and went around and tightened them then did the oil and am about to do the fuel filter, before I got into the task I got home from work and was gonna let the truck cool a bit then as I popped open the hood I smelt a little bit of a diesel aroma lol the truck is 10" high so I wasn't in the motor I was staring at the grill. My question is, is there any specific areas that might be prone to leak that I can check for? Seeing is that its not gonna be a big leak if there is one by the amount of smell I got I just wanted a starting point to get started with so when I get up there I can stay up there for a bit and try to figure this thing out.thanks guys for any and everything you guys help with
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
It is fairly common for the fuel bowl drain valve to leak. When that happens the fuel will run down the train tube to the front of the engine and eventually onto the ground.
The drain tube is connected to the drain valve by a short rubber hose (without any clamps), so if the tube comes loose from the valve, and the valve leaks, then you will have fuel in the valley of the engine. The valley is the space between the cylinder heads.
When your engine cools, take the cap off the radiator overflow tank (degas bottle) and smell the coolant. If you smell fuel then you have a different problem that requires immediate action.
Hope this helps.
The drain tube is connected to the drain valve by a short rubber hose (without any clamps), so if the tube comes loose from the valve, and the valve leaks, then you will have fuel in the valley of the engine. The valley is the space between the cylinder heads.
When your engine cools, take the cap off the radiator overflow tank (degas bottle) and smell the coolant. If you smell fuel then you have a different problem that requires immediate action.
Hope this helps.
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Junior User
Joined: Aug 2010
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From: antioch ca
Ok I might end up checking it in the morn with the darkness I want to make sure I can see everything. thank you. Also which side is the tube on the fuel bowl and does it run down to the axle?
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
The valve is at the back of the fuel bowl (yellow handle). The drain tube exits the valve and heads towards the back of the engine for about an inch or two, then makes a hard 180 turn and runs on top of the passenger cylinder head and turns down the front of the engine block behind the serpentine belt tensioner assembly. If you crawl under the truck from the front and look up, you will see a hard line steel tube about 3/8" diameter at the front passenger side of the engine block.
I don't have a pic....sorry.
I don't have a pic....sorry.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
Here's a link to Dieselorings.com where you can purchase the best mil spec o-rings and also download a set of instructions. CLICK HERE
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Junior User
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From: antioch ca
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I have the exact same year truck and just replaced a fuel line that runs from the pasenger side of the fuel bowl down under the spyder to the back of the engine on same side. It has a clip that holds it behind the spyder that rubs through the line. Its not if that clip will rub through but when. $38.00 dollars from parts guy ed. Of course I had to do the rifraff pleniums and oil cross over mod while I had spyder off. 
good luck
good luck
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Post Fiend
Joined: May 2009
Posts: 5,470
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From: Pea Ridge, AR
The line is for the fuel return it runs along the passenger's side head top of the valley and connects to the rear of the fuel rail near the firewall, there is a clamp around the area that the spyder connects to the IC pipes that is where the leak will be and "when" it leaks it will be very noticable. I'd remove or replace the clamp as good preventive measure.
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Junior User
Joined: Aug 2010
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From: antioch ca
Also I just thought might be a stupid question but I have no muffler could I be getting a diesel smell out the pipe it just dumps out the side. Thanks and sorry if a stupid question lol
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
If your drain valve isn't leaking then you really should smell your engine coolant and see if you have a diesel fuel smell. If so then that is a more complicated fix.
