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Old 07-02-2012, 12:01 PM   #1
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Diesel overspray

Recently purchased a 1998 37 Fleetwood Discovery diesel pusher with a Ford Focus tow vehicle. Took it out for the first time last week and all worked well, however, appeared I got a lot of diesel overspray on the tow bar and bumper/hood of the tow vehicle. Is this normal and would a Splash Guard fix the problem? Ernie

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Old 07-02-2012, 12:24 PM   #2
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Hi and welcome to the forum!

I've never had any noticeable diesel spray on my toad. Let's see what some of our experts have to say on this before you invest in a toad guard to block the spray. There may be something in the engine which needs attention and you don't want to just treat the symptom.

Best of luck.


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Old 07-02-2012, 12:48 PM   #3
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Thanks Rick. Will see if I get any other responses. Will also take to dealer and see what they say.

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Old 07-02-2012, 01:04 PM   #4
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Is it diesel fuel or oil? If oil, the dip sticks of many MH engines are not calibrated well. If you are running with excess oil, your engine may be throwing it out the overflow pipe. That can lead to clogged up rear radiators. Next time you change your oil check the calibration of your dipstick. You may want to add what is known as a slobber can on the overflow pipe.
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Old 07-02-2012, 01:20 PM   #5
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I was wondering the same thing, if it might not be residue from the slobber tube. You might want to look into what/where that is and bring yourself up to speed with some of the issues.
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Old 07-02-2012, 01:28 PM   #6
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This happened to us last summer. We found spray on our towed. Turned out to be the tank that holds the coolant. There were cracks in the tank and we had to replace it.
Larry & Ruth
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Old 07-02-2012, 01:34 PM   #7
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older diesel motorhome lacked good control of engine blowby..,

The "slobber tube" just kinda dumped under the coach.

Newer machines have a mechanism and filter to catch the blowby and return the oil to the crankcase.

Such a thing could be retrofit pretty easily
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Old 07-02-2012, 04:57 PM   #8
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Doubt seriously it is diesel fuel. You would smell it rather strongly. Where would 'overspray' come from? High pressure fuel leaking on a hot engine would be a perfect way for a fire.
Betting it is oil residue from the crankcase breather tube. We had a similar situation with a 300 cat engine years ago. The residue collected on the radiator and that collected dust and dirt causing an over heat. Freightliner added and extension and moved the vent below the radiator. Then it would collect on the towed Honda's bumper and grill.
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Old 07-02-2012, 06:37 PM   #9
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If it is not diesel fuel then you might also want to look at your power steering high pressure line for any small leak. Under pressure it could be blowing back on the back of your RV and toad.
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Old 07-02-2012, 06:43 PM   #10
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If I fill the engine crankcase to the "Full" mark it will throw the oil out onto the toad. It will do that till it reaches about the half way make between "Full" and "Add". Now I just fill to that point and I don't have any problems.
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Old 07-03-2012, 09:37 AM   #11
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There are many things that could be wrong with the engine that could spray on the toad including bad injectors. That would cause extra fuel to be pumped out the exhaust and cover the Toad. Wipe your finger on the residue and smell! You may smell Tranny fluid, Fuel, Antifreeze, or engine oil. The results may send you the right direction or they may tell you nothing beyond the fact that it is not normal and a resolution is needed! It may even be road oil or something that was on the pavement!

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