| [GMCnet] Re: Issue with rough idle and stalling with electric fuel pump [message #364926 is a reply to message #364923] |
Wed, 23 June 2021 11:50   |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma:
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Senior Member |
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What is your fuel pressure with the pump on?
________________________________
From: Tom Lins
Sent: Wednesday, June 23, 2021 11:23 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Issue with rough idle and stalling with electric fuel pump
I have what to me is a strange issue that I don't understand.
I am hoping someone has run into this before or has some things I can check.
Just got the coach out of the storage area and brought it to the house for some cleaning in anticipation on takeing some short trips.
It had been sitting for 8 months or so with fuel stabilizer and an almost full tank.
It was running a little rough so I changed the plugs (NGK) and wires.
It ran noticeably better so I called it a day after doing some cleaning.
Next day I went out to drive it back to the storage yard and during warming it up it started to run very rough and stall.
Some background:
I replaced the failed isolater with a yandina combiner last week and during troubleshooting I got a 20v reading on the center post of the isolater.
I do not have a mechanical fuel pump only a Carter electric pump. That was done by one of the PO's
The carb is a rebuilt I got from JimK just before the Pandemic when I had 2 FITech EFI's go belly up in 2019.
So this carb has not been run more than 500 miles.
Right now when I start it and warm it up it runs rough like it is missing unless I turn off the the electric fuel pump (there is a switch on the
dash)
When I turn off the electric pump after 5 to 7 seconds the idle smooths out at about 900 rpm.
When I turn on the fuel pump after 5 t0 10 seconds it starts running rough and will stall if I do not touch the gas pedal.
I have also noticed that when I turn on the pump the volt meter on the dash drops from about 14 to about 13.
--
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, Aluminum Radiator Quad-Bag Suspension Solar Panel
Manuals on DVD
YOUTUBE Channel: GMC Dealer Training Tapes
http://www.bdub.net/tomlins/
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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