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Old 08-13-2012, 05:11 PM   #1
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Vapor Lock on 89 Ralley Jamboree?

Hello, I am new to this Rv world and posting for info so if I am in the wrong format or thread pls excuse me and lead me to the right world. Here is my question. I have recently purchased a 89 Ralley Jamboree a beautiful 24 foot motorhome, however when driving it in the heat four different times while going up hills the engine has lost power forcing me to the side of the road. After sitting for 10 minutes, it starts back up and I go on my merry way. Usually the temp stays low or immediately goes back to normal upon resume driving. Is this a vapor lock based on being old. any suggestions on what might be causing it? or how to fix it? Love my RV who Ive named JR.
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Old 08-13-2012, 06:01 PM   #2
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It could be a couple of things. The pickup in the fuel tank could be picking up trash when going uphill. The fuel filter may need changed or the fuel pump may not be pushing enough volume.
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Old 08-13-2012, 06:02 PM   #3
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Could be.. could also be something like a fuel pump..

What engine,do you know?
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Old 08-13-2012, 06:18 PM   #4
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Hi Mary, welcome to the forum. Can't help with your question.
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Old 08-14-2012, 10:55 AM   #5
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The Jamboree has a 350 ford engine.
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Old 08-14-2012, 10:56 AM   #6
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Do you think a clothes pin will work, and if so were do I attach it to?
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Old 08-14-2012, 02:36 PM   #7
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Sure sounds like a failing fuel pump. Unfortunately, the gas tank needs to be dropped to replace it.
Double check your engine type. 350 is a Chevy / 351 is a Ford.
The old "clothes pin trick" is to use a bunch of them along the fuel line as a means of cooling the line, but wood is a lousy conductor of heat so I'm not sure it really does much.
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Old 08-14-2012, 07:24 PM   #8
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Probably a weak fuel pump or a dirty fuel filter. Some folks add an electric pump inline to help out.

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Old 08-14-2012, 10:01 PM   #9
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The rv says 350 ford econoline on the front. We changed the fuel filter first but it has done it since,so i guess the pump will be the next option...i was really hoping the cloth pin trick would be a miracle cure
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Old 08-14-2012, 10:03 PM   #10
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thank u much for the advice
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Old 08-14-2012, 11:16 PM   #11
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Quote:
Originally Posted by Mary Buechte View Post
The rv says 350 ford econoline on the front. We changed the fuel filter first but it has done it since,so i guess the pump will be the next option...i was really hoping the cloth pin trick would be a miracle cure
"350" doesn't refer to the engine size, but rather is a Ford one ton chassis. E.g 150- 1/2 ton, 250- 3/4 ton, 350- 1 ton.
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Old 08-15-2012, 08:54 AM   #12
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We had a similar issue with our 98 Chev P30. Ended up having to replace the fuel pump (which as mentioned above, is in the fuel tank and requires partially draining and then dropping the fuel tank to replace). If it can help, one thing I realized after puttering to the nearest service station is that if I had simply pulled the gas cap off, I probably would have avoided the stalling (Knowing that, I probably could have driven to the next big town and gotten it fixed much quicker rather than having to wait for the part in the small town we were stranded in).
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Old 08-15-2012, 03:17 PM   #13
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Mary,
To find out your engine size, there should be a sticker or label under the hood or next to the radiator (hood open) giving a whole bunch of information like vacuum hose routing and tune up specifications. It should also state the size engine your motorhome has. It could be the 351 (5.8 liter) as I already mentioned, but you could also have the big 460 (7.4 liter) V-8. Helps to know that for ordering parts or talking with a mechanic but it may not make a difference for the fuel pump.
Best of luck getting it running good again!
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Old 08-15-2012, 03:41 PM   #14
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Don't know if you're doing your own work but I would change the fuel filter again and this time collect some fuel in a glass jar, that way you can see if crap is coming out of your tank, also will help to establish if you are getting enough fuel pressure. Next, cheapest thing, is vacuum lines, replace all you can see and if you get a squirt bottle and some water with dawn, ivory, etc spray on lines and if you see bubbles that's bad. Next, 350 refers to the chassis and that's a 1 ton chassis. You have either a 460 or 351 and I would suspect a 460. Start at the beginning and do routine stuff. It may solve your problem. Do a tune up, plugs and wires also, a bad plug or wire could also shut you down. Also you possibly could have a bad tank of gas. Gas up at stations that do lots of volume. Good luck
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