Good Sam Club Open Roads Forum: 80's 454 fuel supply challenges
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 > 80's 454 fuel supply challenges

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wa8yxm

Davison Michigan (East of Flint)

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Posted: 07/06/21 05:37pm Link  |  Quote  |  Print  |  Notify Moderator

Often connections on old rigs get a bit tarnished. I've seen it on one car (Wish I'd known it then) but unplug. Spray with De-Oxit. plug/unplug a few tines. Spray with the 2nd De-Ox-It. and they are good as new...

Try unplug replug a few times first though as that will clean 'em De-ox-it slows the re-dirtying


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TUBE PULLER

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Posted: 07/07/21 10:45am Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

Often connections on old rigs get a bit tarnished. I've seen it on one car (Wish I'd known it then) but unplug. Spray with De-Oxit. plug/unplug a few tines. Spray with the 2nd De-Ox-It. and they are good as new...

Try unplug replug a few times first though as that will clean 'em De-ox-it slows the re-dirtying


Caig De-Oxit has saved me many times, good stuff.

TUBE PULLER

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Posted: 07/07/21 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

brycedub wrote:

I did run a quick test of the pump connected directly to the battery at one point before realizing the issue with the switcher, and even bought a switch for just such a scenario. Will try that again with it all hooked up.

Thanks enblethen for the new circuit tip. It still switches the gas gauges, but the power for the high flow, low pressure pump and the switcher are toast. Wonder if the relays back there are bad. Will have to put the ol' multimeter on it.


Reading this got me to thinking, before bypassing everything as I suggested. You may want to bypass the "Switcher" by connecting the fuel lines together with a splice and hose clamps. That would eliminate another possible problem. If you change multiple things at the same time, you can not know what fixed the problem.

PS, "Switcher" I am assuming you are referring to the electric solenoid that switches from one gas tank to the other.

* This post was edited 07/07/21 04:53pm by TUBE PULLER *

Mike W

San Diego

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Posted: 07/07/21 03:52pm Link  |  Quote  |  Print  |  Notify Moderator

I hope you get to a solution. But it almost sounds like you have my old RV. Should be a pic in my profile.


1987 Executive Diplomat 35
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brycedub

SLC, UT

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Posted: 07/12/21 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

Mike W wrote:

I hope you get to a solution. But it almost sounds like you have my old RV. Should be a pic in my profile.


Finally got a photo uploaded to my profile. She's a beaut!

Rick Jay

Greater Springfield area, MA

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Posted: 07/13/21 10:51am Link  |  Quote  |  Print  |  Notify Moderator

brycedub,

I just wanted to say that IS a beautiful looking motorhome. I hope you are quickly able to discover the problem. The mountain in the background is a nice touch, too! [emoticon]

By the way, welcome to being an active poster here on the Forums. [emoticon]
Please remember to post your solution once you finally figure this all out. It's always nice to hear the conclusion of the story, plus it can be helpful for those who have similar problems in the future.

Good Luck to you!

~Rick


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dodge guy

Bartlett IL

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Posted: 07/13/21 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

I would look into the injectors. I had a 90 Dodge comb van with the throttle body injection. It had an injector starting to go bad intermittently. It would lose power and run rough. It was only one injector, but I replaced both and it fixed the issue.
Double check all your electrical connections including powers and grounds. Then check out the injectors.


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2 many 2

USA

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Posted: 07/13/21 05:11pm Link  |  Quote  |  Print  |  Notify Moderator

You are getting lots of excellent feedback from knowledgeable people here.

All my best, that you find your solution, I know how frustrating it can be. Especially when a thousand miles from home.

As mentioned before, if you find a solution, please share that with with us to help others.

I would bet money on electrical, but there are so many other possibilities it could be anything.

Take care............

* This post was edited 08/02/21 06:16am by 2 many 2 *

Jarlaxle

New England

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Posted: 07/14/21 09:54am Link  |  Quote  |  Print  |  Notify Moderator

Before you do anything else: check your grounds! Make sure the engine, fuel tanks, and ECM have good grounds. IIRC, you should have a BIG ground strap from the back of one cylinder head to the framerail. If this is missing or corroded, it can make for all sorts of weird problems.


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TxGearhead

Texas

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Posted: 07/19/21 03:35pm Link  |  Quote  |  Print  |  Notify Moderator

Any chance you could be boiling/vapor locking fuel? I remember hearing that the 454 got so hot "under hood" it would burn out exhaust manifolds.


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