Air Leak in fuel system!!!

corbinstein · 07-14-2008, 11:34 AM

I've got a '94 4X4 12V truck that after sitting for a while has a tendency to not want to start...
Acts Kinda like after a fuel filter change: have to hold it down until it starts, then let off (lots of air)....
I have noticed a little bit of fuel at the bottom of the WIF (water in fuel) sensor and am looking for something to cram in that hole.

Question: is there a filter replacement that doesn't have the hole for the WIF?

I'd like to eliminate the thing if possible.

Also, unless I keep the tank pretty full, it does the same thing, but worse after sitting overnight. I have replaced the flex line from the lift pump to the hard lines on the frame rail and deleted the fuel heater. I am suspecting the lines at the tank, so I am thinking about dropping the tank and replacing those with some regular stuff.... Thanks!
E-mail: ronnie.corbin@genmills.com

bigred95 · 07-18-2008, 04:58 PM

Same problem here. The lines on top of the fuel module were so rusty that when i dropped the tank down little bit they broke. $300 in the hole plus another about $75 for tank straps. Replaced steel lines with rubber but i don't feel confident that this is the best so i bought new lines from stealership for another $260 and hope to get them on tmw. The steel braided line from the supply pump doesn't have a quick disconnect like the return line so I'm gonna have to figure that out. All in all replace with whats there and dont short yourself so you dont have problems in the long run.

corbinstein · 07-23-2008, 09:48 AM

The leak was in the top of the Lift pump, apparently I didn't get enough pipe seal in it last year when I did the install...
I've piped around the fuel heater just to get rid of it, and the Lift pump is new from last year....
I also got rid of the rotten line (braided) between the filter and the frame rail...
Teflon tape works wonders!
Next will attack the tank!

__________________
'94 2500 4X$ BHAF

07-14-2008, 11:34 AM	#1 (permalink)
corbinstein Newbie Join Date: Jun 2008 Posts: 20 corbinstein's Truck Pics	Air Leak in fuel system!!! I've got a '94 4X4 12V truck that after sitting for a while has a tendency to not want to start... Acts Kinda like after a fuel filter change: have to hold it down until it starts, then let off (lots of air).... I have noticed a little bit of fuel at the bottom of the WIF (water in fuel) sensor and am looking for something to cram in that hole. Question: is there a filter replacement that doesn't have the hole for the WIF? I'd like to eliminate the thing if possible. Also, unless I keep the tank pretty full, it does the same thing, but worse after sitting overnight. I have replaced the flex line from the lift pump to the hard lines on the frame rail and deleted the fuel heater. I am suspecting the lines at the tank, so I am thinking about dropping the tank and replacing those with some regular stuff.... Thanks! E-mail: ronnie.corbin@genmills.com

07-23-2008, 09:48 AM	#3 (permalink)
corbinstein Newbie Join Date: Jun 2008 Posts: 20 corbinstein's Truck Pics	Found The Leak!!! Thanks The leak was in the top of the Lift pump, apparently I didn't get enough pipe seal in it last year when I did the install... I've piped around the fuel heater just to get rid of it, and the Lift pump is new from last year.... I also got rid of the rotten line (braided) between the filter and the frame rail... Teflon tape works wonders! Next will attack the tank! __________________ '94 2500 4X$ BHAF

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07-18-2008, 04:58 PM	#2 (permalink)
bigred95 Newbie Join Date: Jul 2008 Location: Norwalk, Oh Posts: 1 bigred95's Truck Pics	Same problem here. The lines on top of the fuel module were so rusty that when i dropped the tank down little bit they broke. $300 in the hole plus another about $75 for tank straps. Replaced steel lines with rubber but i don't feel confident that this is the best so i bought new lines from stealership for another $260 and hope to get them on tmw. The steel braided line from the supply pump doesn't have a quick disconnect like the return line so I'm gonna have to figure that out. All in all replace with whats there and dont short yourself so you dont have problems in the long run.