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Old 09-28-2010, 10:27 AM   #1
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Question Vapor lock fix?

Hey All -
I have been reading the forum with great interest. What a knowledgeable group!
I have a 1986 345 MH that changed my life. I drove it off into the sunset 7 years ago from New York City, met the man of my dreams and have never looked back.
Now the ole girl (not me :-) needs a lotta help, especially if we're going to take her down to Baja for the winter. She's been off the road for 5 years and who knows what we're going to find when we look her over.
The biggest problem I know of is vapor lock. I did a search on the forums here and didn't see a single reference to it. It's apparently a design flaw in this edition.
replaced the exhaust with a Banks system for a little extra power but I've heard the problem is that the fuel and exhaust just run too close together. Has anyone rerouted theirs? I don't want to get caught on a 1000 mile two-lane road in Mexico with vapor lock and nowhere to turn off for my routine 3-hour tuna fish sandwich.
Any ideas on this?
thanks!

Jenniflow
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Old 09-28-2010, 11:02 AM   #2
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Quote:
Originally Posted by Jenniflow View Post
Hey All -
I have been reading the forum with great interest. What a knowledgeable group!
I have a 1986 345 MH that changed my life. I drove it off into the sunset 7 years ago from New York City, met the man of my dreams and have never looked back.
Now the ole girl (not me :-) needs a lotta help, especially if we're going to take her down to Baja for the winter. She's been off the road for 5 years and who knows what we're going to find when we look her over.
The biggest problem I know of is vapor lock. I did a search on the forums here and didn't see a single reference to it. It's apparently a design flaw in this edition.
replaced the exhaust with a Banks system for a little extra power but I've heard the problem is that the fuel and exhaust just run too close together. Has anyone rerouted theirs? I don't want to get caught on a 1000 mile two-lane road in Mexico with vapor lock and nowhere to turn off for my routine 3-hour tuna fish sandwich.
Any ideas on this?
thanks!

Jenniflow
The large Airstream motorhomes use a fuel pump, near the fuel tank.

Could be that's failing to perform properly.

After 24 years, it's really past it's life expectancy.

Andy
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Old 09-28-2010, 11:25 AM   #3
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Quote:
Originally Posted by Jenniflow View Post
I did a search on the forums here and didn't see a single reference to it. It's apparently a design flaw in this edition.
replaced the exhaust with a Banks system for a little extra power but I've heard the problem is that the fuel and exhaust just run too close together. Has anyone rerouted theirs?...
hi jenn' and welcome to the forums...

good u searched and keep at it.

1. herez a diy/fitit/document on the issue...

Chevy P-30 Chassis Vapor Lock Fix 1984

same thing in pdf 4mat...

Chevy P-30 Vapor Lock Fix 1984.pdf

__________

beyond that, there are many threads with references to the issue...

http://www.airforums.com/forums/f310...ump-65559.html

http://www.airforums.com/forums/f311...sue-35170.html

http://www.airforums.com/forums/f159...ills-5842.html

http://www.airforums.com/forums/f159...out-47074.html

http://www.airforums.com/forums/f159...lem-18790.html

http://www.airforums.com/forums/f159...ade-16849.html

http://www.airforums.com/forums/f311...ing-33771.html

http://www.airforums.com/forums/f160...ing-59546.html

http://www.airforums.com/forums/f310...sue-34136.html

it might be worth reading many of those b4 RErouteing lines.

cheers
2air'
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Old 09-28-2010, 11:41 AM   #4
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I didnt take the time to read all those posts and im certainly no expert.

I drive a 92 Ford Econoline Clubwagon (the really big one) which a few years ago had some vapor-lock issues. This summer the mechanics I worked with (I wasnt a mechanic myself, just worked with them) in Yellowstone who deal with vapor-locked vehicles every day recommended dumping in a quart of Marvel Mystery Oil before tackling the big hills. I have no idea what this does (does it just work as an octane booster?) and have never tried it myself, but after seeing them work all summer I trust those mechanics.
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Old 09-28-2010, 06:43 PM   #5
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What great responses, all, thank you. And I agree that we're here on earth to fart around, 2air'. What else is there? And anyway, look around you, that's what everyone is doing. :-D
I'm going to read all the threads on vapor lock and I will check out the fuel pump issue and the Marvel Mystery Oil which sounds like it has a number of uses.
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Old 05-21-2012, 03:10 PM   #6
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make and model for rear fuel pump?

Quote:
Originally Posted by Inland RV Center, In View Post
The large Airstream motorhomes use a fuel pump, near the fuel tank.

Could be that's failing to perform properly.

After 24 years, it's really past it's life expectancy.

Andy
Hey -
I am revisiting this question 2 years later because I had to postpone mobilizing my coach. Now I really do have to move her and suspect I will have to find a replacement rear fuel pump. I do not have access to the coach right now but am doing the research.

Do you know what the make and model would be for the rear fuel pump that Inland RV Center was suggesting needed to be replaced? And the best place to get it from? To repeat, this is a 1986 345 MH.

Thanks so much.
Jennifer
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Old 05-28-2012, 08:35 PM   #7
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I happen to have the box right in reach, since we found a spare when I picked up the 87 345 a couple of days ago. My good friend, the previous owner kept a good inventory of spare parts.
Carter P4070


Carter P4070 In-Line Electric Fuel Pump - Compare prices, reviews, user opinions - Shopper.com
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Old 05-29-2012, 01:11 AM   #8
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Hey, cool! Seriously, PeterH? What do I do? Do I PM you? Feel free to PM me with instructions and a price.

Thanks!
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Old 05-29-2012, 06:12 AM   #9
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Sorry for the misunderstanding, I am keeping the one I have as a spare. The link I provided should point you in the right direction to find one.
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Old 05-29-2012, 06:49 AM   #10
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Electric fuel pumps of that sort are fairly generic. Nothing fancy, IOW. CARTER has been making them forever.

Carter GP4070 - Carter Universal Rotary Vane Electric Fuel Pumps - Overview - SummitRacing.com

is a reliable source from which to buy.

Access to the pump may be somewhat difficult. Consult the FSM.

Also, it would be a good idea to replace ALL soft lines (hose) in the fuel delivery plumbing AND to check the hard lines for kinks, bends and other malformations that can mysteriously appear. Same for mounts as insulators (soft material) can be rotted or hardened over time.

After sitting so many years it would also be a good idea, IMO, to have the fuel tank removed and cleaned by a shop. Age of the unit, and time sitting argue in favor of examining, cleaning and replacing items from fuel tank forward.

.
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Old 05-29-2012, 03:41 PM   #11
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No problem, I can see now that the parts easily available, I'm off to get one. And I'm taking note of the advice about the lines forward. Judging from the shape of a lot of the other lines, there will be a lot of lines to replace!

Thanks again, both of you! :-)
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Old 05-30-2012, 01:52 AM   #12
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I would say that most of the lines are of the 'hard' type, except where being re-routed or hooking up to filters, as well as the engine fuel pump. Still, be on the lookout as you go forward, there will be some areas where the fuel line 'disappears' above tanks and such. You never know, as previous owners like to make changes, that they consider to be superior to what was originally installed. Keep us posted on your progress.
Thanks, Derek
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Old 05-30-2012, 06:17 AM   #13
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pay close attention to the clips that hold the lines to the frame. they are a frequent source for the lines to rust through and leak. one lost tank of fuel would pay for all new lines.
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