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Old 10-25-2010, 03:46 PM   #15
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Originally Posted by Wanabee FTer View Post
If you start replacing parts to try to fix the problem the $$$ will add up fast. The fuel pressure sounds good, anything above 30 psi is ok. If you suspect the fuel pump, drive with tester hooked up and duplicate concern on road test. If it stays above 30 psi, FP should be ok. Your Ford MH has OBDII so most engine functions are monitored by the PCM. If there is no check engine light on, that makes it a little harder to diagnose. You did not mention your odometer reading, but if you are close to 90,000 miles I would replace the spark plugs first (carefully see SP posts) If SP's are new check for any that may have been damaged/cracked during install.
You mentioned you already checked for vacuum leaks, check also for vacuum leaks away from the engine. I found one last week that was on a vacuum line that fell off the firewall area.
If that doesn't fix it then I would say 2 options.

1.) Purchase a hand held OBDII scan tool and see if it has any temporary fault codes stored in memory. (a hard code will cause the CE light to come on, a temporary code will not.)

2.) Wait for the intermittent problem to get worse and it will probably set a check engine light.
John, was that vacuum line leading to a device that regulates the vacuum on the side of the engine compartment?
The vacuum sytem on my rig is very complex and looks mickey mouse with all of the bifurcated lines and fittings going even into the wheel well to the charcoal cannisters.

Tony
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Old 10-25-2010, 03:52 PM   #16
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Tony,
Now we're getting somewhere. It is very common after a rainstorm to pick up a load of fuel from a gas station that has been contaminated with water. I would recommend to check your local auto parts store or walmart for a fuel additive that disperses water. Replacing the fuel filter will not solve this concern.
Water in the fuel is one of the few things that can not be detected by OBDII, and may not set a check engine light.
John, Today I put a bottle of water disperent into the tank as well as more Lucas injector cleaner and hopefully it will slowly correct the problem. It has really fouled up my generator, it runs and backfires so it's sucking from the same source so more than likely the tank is contaminated.
Thanks for your thoughts
Tony
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Old 10-25-2010, 03:58 PM   #17
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The vacuum line I found on my rig that came off was attached to the driver side engine bay near the firewall.
Now that you have found an issue with your generator not running properly, it really sounds like a bad load of gas. In my experience if there is a small amount of contamination it will disperse with additives, If there is say over 1% contamination in the tank, it will probably need to be removed to physically clean it out. If the later is the case the fuel station should be contacted and held responsible for the tank cleaning charges. I would go so far as to threaten to go to small claims if the station is not co-operative.
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Old 10-25-2010, 04:09 PM   #18
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Fuel tank contamination

Quote:
Originally Posted by angelino1 View Post
John, Today I put a bottle of water disperent into the tank as well as more Lucas injector cleaner and hopefully it will slowly correct the problem. It has really fouled up my generator, it runs and backfires so it's sucking from the same source so more than likely the tank is contaminated.
Thanks for your thoughts
Tony
Water is heavier then gasoline, so water being picked up by the engine fuel pickup tube might be a minor problem. But sense the genset is also having problems, I suspect the fuel tank will need to be removed and cleaned out.
The genset fuel pick up tube sits a few inches above the bottom of the tank so it will not deplete the fuel supply if it runs out of gas.
This would indicate to me there is excessive fuel tank contamination that will not be resolved with fuel additives.
Find your gas receipt and call the gas station in Morrow Bay!
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