Hey all you guys that are running the 5.3l chevy motors in your Jeeps, what trans and case are you all running?
5.3 Jeeps
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b_rine
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you guys were right on. it was the cam sensor. couldn't see it below the wires i have running back there... alls good again 
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:dyou guys were right on. It was the cam sensor. Couldn't see it below the wires i have running back there... Alls good again
Got mine running today. Just in time to find the water pump leaks. Gotta get a new pump and take to muffler shop and let er rip. Thanks Dave for all the help so far. Not sure on the tune yet since I havent driven it but it idles good so far and Im sure Wayne done a fine job.
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:smokin:
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exhaust is important to have on a 5.3-6.0. the o2 sensors will read air from outside the exhaust and make it run weird . plus the engine needs some back pressure .
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you need a throttle body or connector for the throttle body?
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Throttle body for an 04 silverado 2500 LQ4. The plug is fine, it just broke the plug part of the throttle body.
In case anyone wants to know the Fwd ASM-5.3L LS4 Oil pan will fit an lq9 and it is pretty low profile. If I had to buy one I woulda went corvette oil pan, but I got this one free so im rolling with it.:smokin:
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good job! i might have one at work. i will look tue.
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test fit the starter. the ls4 starter comes in from the trans side . it might be a tight fit. but i never tried one.
I have a drive-by-wire throttle body from a 5.3. Not sure if they are the same as the 6.0 or not. If it will in fact work for you, shoot me an offer and it's yours!
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It should fit as its really no wider then a truck longitudinal pan. I would be more worried about oil control though mounting it facing fwd might have an adverse effect.
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I've got a question … and despite hours of searching I can't figure it out, yada yada :flipoff2:
I've swapped a 05-06 Jeep Tank and Pump into my Jeep as it puts out the required 60 PSI that my new engine (2002 LQ4) will need.
Essentially the 05-06 tanks have:
- One filler/inlet tube
- One Roll over valve with one barb exiting it,
- A charcoal/vent valve, this "fitting" has two barbs exiting it as well as a 5/8" line/barb.
The 05-06 Jeeps are a RETURNLESS system meaning there is no provision for a fuel return line where as my 2002 6.0 engine does have a return.
So here is my issue, how best to return my fuel to the tank?
1. The two vent lines and rollover valve, will tie into the "vent/breather" on the filler neck to help with filling and act as a vent itself,
2. Fuel Return - 5/8" barb on the charcoal/vent? … Do you think I can RETURN fuel into this barb? If not, do you think I can simply CAP it off?
I figured WORST case I would drill a hole in the tank for a bulkhead fitting and route my return there …
Perhaps this tank needs backpressure to function properly?
Item #5 in the below pic is the 5/8" barb I am considering using as a return ... or capping if you think it's a one-way valve or won't work..
![Image]()
I've swapped a 05-06 Jeep Tank and Pump into my Jeep as it puts out the required 60 PSI that my new engine (2002 LQ4) will need.
Essentially the 05-06 tanks have:
- One filler/inlet tube
- One Roll over valve with one barb exiting it,
- A charcoal/vent valve, this "fitting" has two barbs exiting it as well as a 5/8" line/barb.
The 05-06 Jeeps are a RETURNLESS system meaning there is no provision for a fuel return line where as my 2002 6.0 engine does have a return.
So here is my issue, how best to return my fuel to the tank?
1. The two vent lines and rollover valve, will tie into the "vent/breather" on the filler neck to help with filling and act as a vent itself,
2. Fuel Return - 5/8" barb on the charcoal/vent? … Do you think I can RETURN fuel into this barb? If not, do you think I can simply CAP it off?
I figured WORST case I would drill a hole in the tank for a bulkhead fitting and route my return there …
Perhaps this tank needs backpressure to function properly?
Item #5 in the below pic is the 5/8" barb I am considering using as a return ... or capping if you think it's a one-way valve or won't work..
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2,727 Posts
I've got a question … and despite hours of searching I can't figure it out, yada yada :flipoff2:
I've swapped a 05-06 Jeep Tank and Pump into my Jeep as it puts out the required 60 PSI that my new engine (2002 LQ4) will need.
Essentially the 05-06 tanks have:
- One filler/inlet tube
- One Roll over valve with one barb exiting it,
- A charcoal/vent valve, this "fitting" has two barbs exiting it as well as a 5/8" line/barb.
The 05-06 Jeeps are a RETURNLESS system meaning there is no provision for a fuel return line where as my 2002 6.0 engine does have a return.
So here is my issue, how best to return my fuel to the tank?
1. The two vent lines and rollover valve, will tie into the "vent/breather" on the filler neck to help with filling and act as a vent itself,
2. Fuel Return - 5/8" barb on the charcoal/vent? … Do you think I can RETURN fuel into this barb? If not, do you think I can simply CAP it off?
I figured WORST case I would drill a hole in the tank for a bulkhead fitting and route my return there …
Perhaps this tank needs backpressure to function properly?
Item #5 in the below pic is the 5/8" barb I am considering using as a return ... or capping if you think it's a one-way valve or won't work..
![Image]()
I have done both the bulkhead in the tank for a return, and just blocked off the return on the fuel rail. The FPR will maintain the appropriate pressure at the rail, just as it did in the returnless jeep fuel system
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The number on it is 1257080. They run $120-300 on eBay, I'd really like not to spend that much if possible. Let me know if yours is the same part number please. Thanks again.
I've got one laying around, sent you a PM...
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