The last couple days my truck has been running weird. The engine has been surging randomly while I am driving. Also the engine will start running rough after I start it, especially if it has just been run a few minutes prior. The engine has also started to run rough at a normal idle several times.
Just a little under 2 years ago I bought a return line kit and installed that. I do not see any visible signs of fuel by any of the injector caps. Also, I have a racor fuel/water separator and I do not see any fuel leakage elsewhere in the system. I also replaced the lift pump less than a year ago.
Before I installed the current return line kit, I was having problem with rough idle, but it would clear up after a 30 sec or so of running. This is the first time I have had the engine run like this after driving for a bit. Does this seem like maybe I need a new return line kit again, or could there be something else that I am missing?
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1986 F250 Reg Cab 2wd 6.9l. 76k miles with early Banks turbo.
Last edited by dieselnoob4; 01-14-2013 at 11:46 AM.
Just wondering if anyone has any input on my problem? I am thinking that I will just plan on purchasing another return line kit and go from there. My biggest concern has been the engine surging and rough idle after it has been running for a few minutes. I never had that happen before I put in the current return line kit. Before I installed the current kit, I was only having problems with rough idle and stalling right after I started the engine.
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1986 F250 Reg Cab 2wd 6.9l. 76k miles with early Banks turbo.
I wouldn't concentrate on the return lines, but rather check all potential sources of air intrusion. Fuel heater O-rings, WIF sensor, return lines & caps, etc. You might save yourself the hassle of doing return lines. Or you may find that the return lines AND something else are letting air in.
1990 Jeep Wrangler Sahara, 4.2l, 5-speed, Dana 30/35 w/3.07s (for now!), 33x10.5x15 BFG Mud-Terrain KM2s on 4" Rough Country springs. Engine being rebuilt after an awesome afternoon in the mud LOL
Other than leaking return lines should have no effect on a running engine. I would first check for leaks on suction( supply side) to include the tank pickup.
I had almost the same problem and I found I had #4 cylinder going dead. I found I had a injector stop working on #4 cylinder. So I ordered all new injectors and installed em and it went away.
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"Nitrous is like hot girl with with STD's. You know you wanna hit it, but your afraid of the consequences."
66 Ford F100 - Project SickUp
85 Ford F-350 Crew cab Dually - Project Bagged on Semi'z
Last edited by SixtySix Ford; 01-17-2013 at 09:26 AM.
If you still have the factory water separator on the firewall, the drains are a known issue. Clamp a bolt in the rubber drain line, and see if that helps.
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(for now!), 33x10.5x15 BFG Mud-Terrain KM2s on 4" Rough Country springs. Engine being rebuilt after an awesome afternoon in the mud LOL
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