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MosersRam
 
  Fuel leak - Posted: 07-18-2011, 12:15 AM
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Post #1

I'm trying to figure out what is going on with my old Dodge 1500 pickup. It's a '97 with a 5.2 and it seems to have a fuel leak that comes and goes. Sometimes it will leak when you stop after driving it for a while and most of the time it is dry as a bone. Someone said there is a check valve of some sort that is getting hung up occasionally. I had not seen it leak for a while until today when I stopped outside the house and you could smell it. I looked under the truck and it was dripping off the tank. I ran it down to my work garage and in the time it took to go the 2 blocks it had quit.

Anyone know what this is all about?
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BigGreenV10
 
 Posted: 07-18-2011, 08:03 AM
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Post #2

You need to keep a log of when it does it and what you had just done meaning did you put a certain level of fuel or drive so far or sat for a while.
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Monsta
 
 Posted: 07-18-2011, 08:44 AM
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Post #3

If it was dripping from your tank, I'd probably figure theres a hole in your tank, or the fuel pump isn't tight on the tank or something, or fuel lines loose or fuel line is cracked or have a hole.
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Moparite
 
 Posted: 07-18-2011, 09:21 AM
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Post #4

Check the fuel pressure line and return line on top of the tank. The connector might be leaking also.
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mad 1
 
 Posted: 07-18-2011, 10:05 PM
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Post #5

can remove the inner fender well and will be able to see the top of fuel pump and lines to see where leak is from
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MosersRam
 
 Posted: 07-18-2011, 11:56 PM
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Post #6

Thanks for the replies fellows. 99.9% of the time it is dry, one of the guys at work said it has something to do with the evap cannister. The one time that I saw it leaking really bad it was coming from the top of the tank, but quit like you turned a spicket off in about 15 seconds. The truck was idling in park that whole time.

It seems worse with a 1/2+ to full tank, and hot weather, and no it is not expanding and blowing out the top of the tank. It is always running when it leaks. I fill the tank all the time and you can run several tanks without seeing or smelling the leak. I can always smell it when it is leaking. The mileage has not shown significant problems until this last tank when it went WAYYYY down, like to 10 mpg from the usual 15, I blamed it on towing the boat almost the entire tank full, but now I'm not sure.

I guess I'll have to get in there and try to catch it in the act to figure it out.
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1997 Ram 1500, 5.2L, auto, 2wd, 170K
Towing package plus second trans cooler, trans temp gauge
Felpro plenum gasket repair

Coming soon JR shift kit

Pulling a 20 foot Forester pontoon boat all around the Raystown Country
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MosersRam
 
 Posted: 07-31-2011, 10:10 PM
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Post #7

I watched it run for ten minutes today before it started to "perculate" out of the top of the fuel pump. It was coming out of the elbow just to the left of the electrical connection as you look in the left rear wheel well. I took the gas cap off and it quit immediately. I drilled one small hole on the inside and one on the oudside to "vent" the locking cap. I expect to see a check engine light soon but the truck is running fine and not blowing $4 gallon fuel out like a coffee pot.
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1997 Ram 1500, 5.2L, auto, 2wd, 170K
Towing package plus second trans cooler, trans temp gauge
Felpro plenum gasket repair

Coming soon JR shift kit

Pulling a 20 foot Forester pontoon boat all around the Raystown Country
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