Only reason I say "suck air" is because when I bleed it, it is mint for a little while, and real quiet too???
Fuel filter housing
- Thread starter JustinD
- Start date
Both pumps are working and seem to be running smooth, I crawled under the truck with the key on and because they are so quiet I had to put my hands on them to verfy they were running, both seem the same and they are running, not loud or cutting out??? I'll be leaving work soon and I'll see if I can get a gauge on it.
X2 if it's leaking you should see it though and the lift pump will over come the vacuum
No leaks anywhere, only thing I can think of next is to drop the tank and make sure that the rubber suction tube isn't cracked or wasted??
Did you check the lines Before the pump like a stated before? The Kennedy pumps are pretty sensitive to air. To much and they could be intermittent. I had this before on my old truck. The nut came loose on the AN 90 coming off the pickup. Sometimes I would have 10 psi other times 5 psi and other times 0 if they both got to much air in them. Eventually it would work its way out if I was driving. It did it a lot when I would get in it more then 3/4 trottle.
I don't know a whole lot but seems like you could fill the tank alllllllll the way up, topped off as much as possible and that'd give you a good indicator if the pickup hose is cracked or anything. Because all of it would be under fuel. Downside is if it is cracked you got a full tank of fuel to wrestle with :spit:
Sint frum tha orijinul smert fone
Possiblity of too much rail pressure at idle?
I'm reading all air leak issue's, just thinking in a different direction here...
I'm reading all air leak issue's, just thinking in a different direction here...
When I had dual TTS pumps (same pump without the fancy aluminum head) I typically saw around 7 psi after the factory fuel filter.
I read 7-8 psi at an idle, but if I unplug them it doesn't hold any vacuum? Shouldn't it have a little vacuum? Side of my fuel tank is wet and stained with fuel, gonna see if I can yank the bed off tomorrow and inspect the lines from the tank to the lift pump, it is bone dry from the pumps forward, has to be under there. Or the suction line in the tank?
If it was the sucktion line in the tank there shouldnt be fuel on the side of the tank....there should be some vacuum but i wouldnt imagine it would be to much at idle...
I think the bulkhead fitting may have come loose??? How else would I get fuel on the top of my tank? I checked from the lift pumps foward, no leaks there. I imagine if there was a leak on that side of the pump it would make a huge mess??? I have no leaks and no smell of fuel. Seems like the only place left to look is in or around the tank. The fuel on the tank might be a whole other issue but its getting air from somewhere.
Pulled the bed off, bulkhead fitting was loose and the -10 fitting on the inside was 1/2" and the suction hose is 5/8" bought a new -10 x 5/8" push-lok gonna put it all back together, hopefully that was my air suction issue? Painted the chassis while I had the bed off too.
Attachments
Well, that was not the issue..............rattled about 2 hours later.
Before work this morning I unplugged the power to my lift pumps, drove about 20 mins to work, seems alot quieter almost no rattle??????? Its no where as snappy as with the pumps plugged in. I checked them a couple days ago and the gauge read about 8psi at idle. Could the pumps cause this condition and still hold at 8psi???
Before work this morning I unplugged the power to my lift pumps, drove about 20 mins to work, seems alot quieter almost no rattle??????? Its no where as snappy as with the pumps plugged in. I checked them a couple days ago and the gauge read about 8psi at idle. Could the pumps cause this condition and still hold at 8psi???
Maybe your fcim is not liking the postive pressure anymore? And instead of loping your getting a steady rattle?
I took the lift pumps completely out, runs good with no pump, that would have to mean I have no air leaks right? If it were sucking air now it wouldn't run, no pump to push through it. We checked the sending unit, the top push lock fitting was wrong, we changed it made sure it sealed good, reassembled the billet pick up, tightened the fittings, ran a new line from the top of the tank to the back of the lift pumps, only ran good for about 2 hours then started to rattle again, Sunday morning I took the hose off the lift pumps and put it in a bucket and turned the key on, it was pure foam. Took them out and just jumped the lines together (like it was factory) and it seems to run real good, not as snappy but alot quieter.
We checked the sending unit, the top push lock fitting was wrong, we changed it made sure it sealed good, reassembled the billet pick up, tightened the fittings, ran a new line from the top of the tank to the back of the lift pumps, only ran good for about 2 hours then started to rattle again, Sunday morning I took the hose off the lift pumps and put it in a bucket and turned the key on, it was pure foam. Took them out and just jumped the lines together (like it was factory) and it seems to run real good, not as snappy but alot quieter.
Still running good, no rattle. Gonna test the pumps and figure out what to do, do I rebuild the Kennedy pumps, or just buy an Airdog or FASS? I like the Kennedy pumps alot they are quiet and tuck way up high, no big gay white filter hanging down. Airdog and FASS are great systems just huge.