Fass install.........fuel leak at tank
 

Well everyone, i have what i consider a "major" fuel leak at my tank. It appears all my fittings are dry from the install. I did however leave the old suction line from the tank where it sits and i am wondering if thats where my fuel is coming from....It appears to be it but everything is soaked in fuel so i honestly am not positive. If anyone knows whether the leak would be from the old suction line or not would be greatly appreciated

I did the same thing a freaked. Drain all the fuel out of your old filter canister with the water seperator and see if it still does it tomorrow. It only takes a little fuel to look like a lot the way it spreads. I drained mine and the leak was gone.

Andy

ok so then.........where is the fuel coming from and what does the factory fuel filter canister have to do with it lol

Fuel should not come out of any of the tubes on top of the tank as long as you still have the module in place. I would put my bets on the threaded ring that holds the module down not being on straight. This allows the module to move around in the tank as the fuel sloshes and let's fuel leak out the seal.

well i only have an 1/8 tank of fuel in it now.......cant see how driving down a flat smooth road will slosh fuel way up and out enough to make the mess its making

If all the fittings and fuel line are dry, it's the only place left. You did get the Vent hose hooked back up right. The smaller hose that runs along side your fuel filler hose.

You have also check both fuel lines, both the supply line and the fuel return line.

yeah thats all fine, and i never touched the ring for the module.....im still thinking its something to do with that factory disconnected suction line...

Theres nothing attached to it, right. If not it is just a dead line that goes all the way to the bottom of the tank, with a screen at the bottom and a 45degree bend in it. Would be next to impossible for fuel to come up that tube with nothing for suction pulling it. By the way, you way want to cap that to keep road spray out of the tank.

How did you put the new pick up in without removing the module from the tank. I hope you did'nt drill a hole while it was still in the tank.

say what now about road spray and the bottom of the tank......everything i did was on top of the tank at the module and theres nothing open that goes to the tank for "road spray"

what are you talking about a "pick up".......the only thing i did that involved the tank was take the factory suction line off and replace it with FASS suction line and took off the filler neck to put the return coupler thing back in.......where are you getting anything about a pick up

You were talking about the old suction line leaking fuel, so I assumed you installed a new fuel pick up in the tank and the old one was sittin empty. Must have been wrong there.

So the fuel is leaking out of the top of the tank someplace right.

You say the fitting that attaches the new fule line to the old stock pickup is not wet. I am still on track so far.

correct, but i think fuel is somehow coming out of the old factory suction line

This where you lose me. coming out of the module you have A fuel pick up tube, a fuel return line, a dead tube that sometimes has a cap on it and your wiring for the fuel guage.

By suction line I assumed you were talking about the fuel pick up tube. This should attach to a fuel line that leads to your new pump. Did you replace this fuel line bteween the tank and the new pump.

Sorry about the confusion, but this is internet and typed words so sometimes you have to back up and re-group a little. But we will figure it out.

its the only fitting you remove on the top of the tank module, the one towrds the back of the truck.

FASS calles it a suction line......not sure what else to tell ya besides its the line thats the furthest back on the module

Ok, that the pick up/supply line. Did you remove it from the module.

If so and you put the same line back on then that is also a likely problem. Those little plastic pieces are a buggar to get off without damaging them. When you put em back on they don't lock on right.

noooooooooooo no no no, the FASS replaced that with their own line and a new quick disconnect fitting.....the original factory pick up/supply line is just sitting on top of the tank. Is this where my leak is?

Since it is completely disconnected at both ends it may just be leaking out left over fuel. That would be the simplest thing it could be.

but only when the truck is moving?

Moving or not would affect it, no. I would wipe it all dry and let the truck idle for a few minutes. Check under there and see if it is wet. If it is then you have a fitting someplace leaking. If it is still dry after idling then drive it a few miles and check again. If it's only wet after driving it is either a very slow leak that looks bigger then it is or the tank itself is leaking. There are some things that could prove this all wrong but this will track down almost all the possibilties.

HIGHLY doubt the tank would myseriously start leaking the day i install a new fuel system.............im gonna start with what dazed said and drain my old fuel flter canister, im goin to bed now ill check this in the AM for more replies

If you didn't change the return line fitting also, I'm still bettin on the new suction line fitting is not sealed though. So keep feeling down the metal part of the suction tube to see if it is wet while your doin this. You can also use talc powder or flour to check this. Just sort of dust the module area and rive it a few miles, your leak will show right up.

Some times in all the pullin and pushin they will crack open if they are aready rusted and in bad shape, and many are.

What you are seeing is the left over fuel from your old fuel filter running back the stock fuel line you disconected when you put the fass system in it. Drain your old fuel filter bowl and I bet your problem will go away. You still have fuel in there and with the line open on both ends it is going to move when you drive the truck and look for a place to escape. Unless you cracked the fitting replacing the pickup line(which I doubt) that is your only problem.

Andy

I've not seen a water bleeder on one of these trucks yet that is rusted or coroded around here, guess it depends on where you are.

You just mentioned the same thing I was talking about in your previous post. We never were talking about the fuel filter end of things, all of our conversation was based around the tank area and I was reffering to the pickup line fitting being corroded.:ph:

Gotta ya now, this thread is confusing me:s:lol. If his system was like my performer all he had to do was push the plastic clip and remove the old pickup line, then install the new pickup line on the hose. I didnt trust that fitting sitting in the hose so I put a hose clamp around it and snugged it up a little.

the pick up line fiting is brand new from FASS

Mine was brand new as well, I just clamped the hose for a little added protection. I still say it is just fuel left over in the stock line and fliter housing. Drain it and see if your leak stops.

Andy

im going to

Let us know if it works.

Andy

will do, im also going to re mount the FASS system itself as the guy helping me mounted it all weird

i did what andy did on my FASS i didnt use the quick disconnect, i use a good ole hose clamp seemed like a better setup to me. id say andy's right about the fuel drainin back.

all fittings are dry, checked with truck running.

i found out there was fuel at the tank side of the filler tube, so i cranked down that hose clamp and it broke, put a new hose clamp on it.

Drained all fuel from old fuel filter canister and re mounted FASS on rear slots.

I am going to go drive it now and see what happens!

mine did the same thing when I put the FASS on. It stopped when the old suction line was empty. I also remove the old filter canister since it was being bypassed anyway. There shouldn't be any more fuel leaking out after a day or two.

Exactly!:up:

No sure if this has been answered BUT here goes:

The fuel is coming from the old steel supply line that ran to the LP that you disconnected when you unhooked it from the top of the tank to install the FASS. You can either put some compressed air on the LP end of the line and blow it out OR remove the old line or just put up with it as it will go away.

This is to say that as you describe all fittings are good etc.:c:

well, i drained all fuel from the old fuel filter canister and like i said i put a new hose clamp on the tank end of the filler tube. I still saw some fuel leaking from somewhere on my tank when i got out to the house i am at now but like others have said, im hoping its just from that steel line.

It took mine like three days to work it all out of the line.

Andy