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Old 01-12-2025, 03:42 PM   #1
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2011 Itasca Impulse Engine/Fuel Delivery Issue?

I just purchased the above RV. Leaving the area and driving at a slow rate of speed under 20mph everything runs fine. Once I hit the roadway the engine will start to accelerate and then just decelerate. I have to keep pumping the gas pedal and I can maintain a speed.

When I contacted the seller, I was told the fuel is about a year old. I stopped and added seafoam and an octane booster, when the tank got down to 3/4 of a tank I filled it with higher octane fuel.

The issu has not yet stopped, also when I start the generator, it will start immediately and run for a short time and shut off. I can restart the generator and it will continue to shut off.

Since the generator seems to have fuel issues too, I ruled out a fuel pump. I was wondering if there is a fuel filter that both engine and generator get fuel through that could be an issue with crude and dirt.

Any suggestions?
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Old 01-13-2025, 11:01 AM   #2
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Hi Bill,
The fuel filters are separate; one for the main motor, and one for the generator.
How many ounces of Sea Foam did you add to how many gallons of gasoline?
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Old 01-13-2025, 12:06 PM   #3
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2011 Impulse were all on the Ford chassis I believe.

A fuel pressure gauge would help diagnose the issue. Parts stores have loaners. That something you could do?

The was you have described it, it does sound like a fuel issue. Plugged cats act similar, but the complaint is usually more like it won't go over 50 MPH, not 20.

Check engine light isn't on, right? Worth checking for codes no matter what. Might be a pending code that might send you in the right direction.

Also sounds like it may have sat a lot. Rodent damage is a possibility, both underhood, or on top of the fuel tank. Any signs of nests?
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Old 01-14-2025, 02:22 PM   #4
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Quote:
Originally Posted by Eagle5 View Post
Hi Bill,
The fuel filters are separate; one for the main motor, and one for the generator.
How many ounces of Sea Foam did you add to how many gallons of gasoline?
Eagle5
I used the entire can of Seafoam for a tank with 55 gals in it.

Upon looking at the generator it looks like the fuel filter has never been changed, once I did that it ran continually till I put it under load.
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Old 01-14-2025, 02:23 PM   #5
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Quote:
Originally Posted by tderonne View Post
2011 Impulse were all on the Ford chassis I believe.

A fuel pressure gauge would help diagnose the issue. Parts stores have loaners. That something you could do?

The was you have described it, it does sound like a fuel issue. Plugged cats act similar, but the complaint is usually more like it won't go over 50 MPH, not 20.

Check engine light isn't on, right? Worth checking for codes no matter what. Might be a pending code that might send you in the right direction.

Also sounds like it may have sat a lot. Rodent damage is a possibility, both underhood, or on top of the fuel tank. Any signs of nests?
Have found no rodent damage or nests of any kind. No check engine light, but I will put scanner on to see if any codes pendning.
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Old 01-14-2025, 11:00 PM   #6
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Quote:
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I used the entire can of Seafoam for a tank with 55 gals in it.

Upon looking at the generator it looks like the fuel filter has never been changed, once I did that it ran continually till I put it under load.
For 55 gallons, you need at least 55 ounces of Sea Foam; that would be 3½ bottles. You could also double that amount for the first treatment; i.e. seven bottles. The fuel in the tank may be much older than just one year. Sounds like things are pretty gummed-up.
As for me, I run one ounce of Sea Foam for each gallon of fuel. However, when on a long trip, I don't bother to add Sea Foam; I just bring it up-to-snuff with my top-off fueling, and then run the Generator once more to be sure I have that one gallon of gasoline to one ounce of Sea Foam ratio. That way, if I don't use my motorhome for a couple of months, my Generator still starts and runs well.
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Old 01-20-2025, 06:14 PM   #7
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We had a gas generator in an old Vectra that would start up and die over and over. My back yard mech told me to put a can of Seafoam in a gallon gas can and then fill the can with fresh gas. The idea was to get the seafoam into the carb and let it do it's thing.
I did and the first two times I started it the generator sputtered and died, the third time it ran and burned through the entire can of Seafoam and the gallon of gas.
I never had a problem with it after that.
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