so my 6.2 is leaking fuel. its leaking a few drips every second so its enough that it leaves a trail behind it when I go up and down the driveway. the pool of fuel when it sits idling ends up under the backside of the engine. I checked the fuel lines the best I could and didn't find any breaks or holes. its not coming off the top of the engine so its not the injection pump. im just kind of looking for some insight on where I should look next. it dark out now so I haven't taken a look yet but the diagrams I've checked show that the fuel filter has like a over flow tube or something that kind of hangs down below it? think maybe the filter is just clogged and its venting out that tube?

 

Pump a little air into tank have seen a tire valve inserted into a gas burner fuel cap as they are non vented pump 10 to 15 lbs of air into fuel tank and you will find any leak you have get these fixed if its a dripping fuel it has to be sucking some air and that a bad thing for the performance for any Diesel especially the 6.2/6.5

 

Is it also harder to start the first start of the day?

The most common leaks are from the fuel filter housing,there are special O-rings that seal the water in fuel sensor and the fuel heater - the housing needs to be removed to repair them.

Also another good source for a leak is the water in fuel drain Tee-valve mounted to the coolant crossover-if it's not closed properly it'll have a leak.

 

I second the fuel filter housing. If it's at the back of the engine. The fuel heat element is bad for leaking through itself too. If that is the case there is an option over a new fuel heater element as they are pricey. I have dealt with this issue several times on mine.

 

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Common leak areas are the o rings, as mentioned in the previous post.

Look inside your valley pan, with a flash light and try to see if its wet? Or can you smell diesel?

If so your 5/16 rubber fuel line is probably shot...leaking. pull the intake manifold off and replace the line its about 1 foot usually give or take.

sorted she will fire up on first crank.

 

so thanks for the replys everyone. I was under the hood today and narrowed the search down a bit. its not the fuel filter or filter housing. I pulled the intake off and the valley betwean the valve covers is pretty wet with diesel and some water from the rain. I checked the injection pump and couldnt find any visible leaks. at least nothing serious enough to **** fuel under it like it is. I followed the fuel lines from the tank along the frame as far as I could and they were dry. I got my brother to rev the engine up for me because it leaks way more when reving and I looked under the truck and under the hood and couldnt find a visible leak. so now im wondering what it could be. I think it must be what fommy100 mentioned but I want to exhaust all my options before I start to take the intake manifold off. is this line fommy is talking about a return line? and where does it come from and go to? im thinking where ever the leak is it most be a return line because the engine seams to run fine.

anyways guys any help would be appreciated. I've got a car with 49,400km on it and I want to park it so when I trade it in it still has less then 50,000km.

 

Hello

There..........okay, there are 2 locations for the fM80 one is on the fire wall. On this one replace the 5/16 rubber fuel line from the bottom of the fuel filter to the inlet on the IP.


The other is mounted to the back of the intake manifold. remove the intake manifold and replace the 5/16 fuel line from the back of the fuel filter to the intake on the IP.

These pipes rot out from underneath, so you might not see the split or cracks in the rubber fuel line just looking at it.. It don't hurt to double clip the new fuel line also...keep everything leak tight.


In short do not trust the old line underneath the manifold extreme heat and low sulfur diesel do a number on the fuel lines.


hope this helps you.

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Most intake manifold gaskets can be reused, so you don't have to buy new gaskets in most cases. Take plenty of pictures with your phone and use a old piece of cardboard to keep the bolts in order. The 5/16 rubber fuel line and clips run about $2-3 dollars from auto parts store. And she run like a dream again.

 

so i pulled the intake manifold today. the lines looked fine so I just put it back together. I purchased the gasket before I did the job and didn't use it because the old one was fine.(apparently you cant return fel pro gaskets after there open so i'll have a spare...) anyways I looked around some more and it turns out the rubber line that comes off the metal line on the frame has a crack in it right where it goes into the lift pump. its the bigger of the two lines. im about to go and change the line out right now. if this doesn't fix the problem i'll be taking the intake manifold off again and doing the lines under it.

slightly off topic, the lines from the tank on my truck go to the lift pump before the filter? they come along the frame then over to the lift pump and then up to the injection pump? something seams wrong with this. I might be following the lines wrong but they diffidently go to the lift pump before the filter. is it supposed to be like this?

 

Yes,thats how its made,there is a sock in the tank for filtering before lift pump.

 

That is correct-pumps push fuel much better than they suck it and most filters work better under pressure than suction.

Your layout is wrong though,it goes like this.

The fuel tank is vented through the filler cap.
Fuel from the tank exits through the sending unit.
It is then sucked through the sock on the sending unit by the lift pump.
The lift pump then sends fuel to the filter and once filtered fuel travels on to the IP.
Excess fuel from the IP and injectors is then returned by the return line back to the tank through the sending unit.