| It wasn't VAPOR LOCK [message #284196] |
Fri, 07 August 2015 09:07  |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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A few weeks ago I asked for help in diagnosing a fuel starvation situation.
The problem turned out to be a failed electric fuel pump. The pump was on the coach when I bought it in 2002 and has always worked in the past so I didn't suspect it.
After eliminating other possibilities I determined that I had power to the pump but it would not run.
I removed the pump and spliced the fuel line. Last Thursday it was 111F in Red Bluff so I was thankful that it was only 107F on Friday when I made the 80 mile trip back up the mountains. The coach made the grades with no fuel starvation symptoms.
The only changes from the previous trips were higher ambient temps and no electric fuel pump.
I assume that the failed pump restricted the fuel flow. I ordered a replacement pump and will install it, just in case. But it is good to know that I'm not getting vapor lock with high heat, heavy engine load, and cheap Arco gas.
Thanks to all who replied with suggestions.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] It wasn't VAPOR LOCK [message #284209 is a reply to message #284196] |
Fri, 07 August 2015 10:41  |
Jim at the Co-op
Messages: 291
Registered: May 2014
Location: Orlando Florida
Karma: 2
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Senior Member |
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If you are putting in the electric pump in the main line, be sure it does
not have an internal check valvr. You want it to flow when off if you use
it as a backup and still run a mechanical pump too. We put the electric
pump on the front tank before the fuel selector solenoid so there is no
possible obstruction (a home run) on the main tank to the mechanical fuel
pump and kick in the electric pump when you switch to the Aux. tank. That
way you can get the benefit of having a second pump if needbe
Jim Bounds
--------------------------
On Fri, Aug 7, 2015 at 10:07 AM, gene barrow wrote:
> A few weeks ago I asked for help in diagnosing a fuel starvation situation.
>
> The problem turned out to be a failed electric fuel pump. The pump was on
> the coach when I bought it in 2002 and has always worked in the past so I
> didn't suspect it.
> After eliminating other possibilities I determined that I had power to the
> pump but it would not run.
>
> I removed the pump and spliced the fuel line. Last Thursday it was 111F in
> Red Bluff so I was thankful that it was only 107F on Friday when I made the
> 80 mile trip back up the mountains. The coach made the grades with no fuel
> starvation symptoms.
>
> The only changes from the previous trips were higher ambient temps and no
> electric fuel pump.
>
> I assume that the failed pump restricted the fuel flow. I ordered a
> replacement pump and will install it, just in case. But it is good to know
> that
> I'm not getting vapor lock with high heat, heavy engine load, and cheap
> Arco gas.
>
> Thanks to all who replied with suggestions.
> --
> Gene Barrow
> Lake Almanor, Ca.
> 1976 Palm Beach
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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