| [GMCnet] Electronic Fuel Pump Chatter (Mark Kasiewicz) [message #183368] |
Thu, 06 September 2012 13:48  |
mmmm ka
Messages: 45
Registered: May 2012
Karma: 0
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Working on my GMC and I hear a chatter that I trace to a Napa electronic Fuel Pump mounted amidships on the driver's side frame. Engine is off. No key in ignition. It does turn off when I disconnect both batteries. I have never heard this noise before.
Is the some reason this should be coming on without the engine or generator running ?
Does anyone know what the purpose of this pump is ?
There are a lot of unmarked switches installed by the PO on the dash. Would there be a reason to have a aux pump activated by a switch on the dash ?
Thanks for any ideas !
Mark Kasiewicz and Dawn Koepp
77 Kingsley (Orange shag carpet and all)
Gus da Bus
Eau Claire, WI
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| Re: [GMCnet] Electronic Fuel Pump Chatter (Mark Kasiewicz) [message #183370 is a reply to message #183368] |
Thu, 06 September 2012 13:57  |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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Many folks have mounted an electric fuel pump by the tanks to try to avoid vapor lock from the front mounted mechanical pump with today's ethanol laced fuels.
It probably is switched from one of the dash switches, and you will probably have to do a bit of detective work to find what is powering the pump. Some folks would turn them on if they sensed that vapor lock was imminent, others use the pump all the time. You might want to check if the original mechanical pump is in place on the lower right hand right side of the engine.
Either way, the pump shouldn't be running when the coach is not!
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Electronic Fuel Pump Chatter (Mark Kasiewicz) [message #183394 is a reply to message #183388] |
Thu, 06 September 2012 16:45 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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Mark, you could do what the PO did in my coach - hook up the supplemental fuel pump with a lighted toggle switch (as well as labeling it on the dash). I like that since it makes it obvious if you forget and leave it on.
I won't have to worry about that after I get my TBI fuel injection system installed though...
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Electronic Fuel Pump Chatter (Mark Kasiewicz) [message #183395 is a reply to message #183388] |
Thu, 06 September 2012 16:49 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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P.P.O. installed an electric fuel pump in the fuel line, before going to the engine mounted fuel pump, then the carb. I believe that he installed it for; 1. to help with vapor lock, since the coach came out of Central Texas, and 2. To re-fill the carb bowl when the coach has been sitting and heat has emptied the carb bowl.
I use it to prime the carb, by turning it on a few seconds before starting the engine. I also turn it on if the engine is stumbling, as in approaching a vapor lock situation. This has helped many times over this hot summer. It is approaching 100 degree F. outside today. Hot and muggy.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
[Updated on: Thu, 06 September 2012 16:50] Report message to a moderator |
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| Re: [GMCnet] Electronic Fuel Pump Chatter (Mark Kasiewicz) [message #183592 is a reply to message #183534] |
Fri, 07 September 2012 21:41 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
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| Hal Kading wrote on Fri, 07 September 2012 12:41 |
Mark,
The electric fuel pump should be rewired so it is not on unless the ignition switch (key) is on. Some wire the electric pump to the alternator post on the battery isolator, others wire it through an oil pressure switch, so it stops in the event of an accident.
Hal Kading 78 Buskirk Las Cruces NM
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Mark,
I use a relay on my coach that is activated by the ignition being turned on. Wire the relay from any power source and the other side of the relay going to the fuel pump and then to ground. I used a #10 wire going from the relay to the fuel to reduce resistance. I don't wire the power source that goes to the fuel pump using the ignition. I don't like to take a chance on overloading the ignition.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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