01blackspeeper

just lateley my truck has been starting harder and harder. first only when it was warm. now all the time. then i drove it about 40 miles. i have 3/4 of a tank when i got home i hade under 1/8 tank of fuel. i was told to check the copper seals on the injectors and have them pop tested to see if i have a leeking injector. i was wondering what u guys were thinking. o ya i know i have asmall fuel leek it drips once in wile but i iwould have noticed that much fuel leeking when i came out of the store.

KATOOM

Your starting problem is because of the fuel leak you mentioned. Simply put, the entire fuel system work on a prime which means that there is always fuel in the lines. But.....when you have a fuel leak then air is allowed to enter the system which then allows the fuel to drain back to the fuel tank. Then what happens is the fuel pump is forced to re-prime the system every time the prime is lost. That means that if the leak is very small then the time it takes for the fuel to drain out (or for the prime to be lost) is slow and your truck may start fine unless its been sitting for awhile, like overnight. But when the leak gets larger then the fuel will drain faster and the truck will hard start more often.

The best way to find out if a fuel leak is your problem is to park the truck with the nose pointing downhill. That way the fuel tank is more level with the fuel lines removing gravity from the equation and thus the fuel will not drain out.

The leak is also most likely on the return side of the fuel system since if it was on the supply side then it would spray or drip fuel when th fuel pump was running. The most likely places to look is the banjo bolt on the back drivers side of the head and the T-fitting that sits just below it.

01blackspeeper

I know where thee leek is its a fitting on my regulator. it just started starting hard and what about the 25 gal of diesel lost in 40 miles

KATOOM

Sounds like that leak is a little bigger than you think. Diesel will leave a thin oily residue so look around. You could also check your engine oil level to see if its any higher than it should be, which would indicate a bad injector dumping fuel in a cylinder.....but you should have noticed other issues if that was the case.

SIXSLUG

If you are leaking fuel into the cylinders I would imagine you would see it in your exhaust as black smoke, and pretty thick at 25 gallons to 40 miles.

Put it in neutral and rev it to around 1800rpm for 30 seconds, then see what shows up underneath. If you're using that much fuel it'll show up on the ground.

Hard starting and excessive fuel consumption could also be a worn vp44.

01blackspeeper

i did notice that it smowke a lot more but now all the time just when i was takeing off. i was also thinking it was my vp44 but i wasnt for sure.