Plugged fuel vacuum switch
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New User
Joined: Jan 2013
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From: Stillwater, OK
Plugged fuel vacuum switch
I have a 95 7.3L that has the fuel vacuum switch located on the bottom of the bowl, towards the firewall. It was leaking so I plugged it with a 1/8" plug. As soon as I started the truck the CEL came on. The truck ran noticably better, but I am not sure why the CEL is on. If anything, the fuel filter light in the dash should come on. Being on a tight budget, the local shop wants to charge $125 to hook up to my computer and read the codes, because my truck is too old for the retailers to read?? Any pointers as to why the CEL came on and what is wrong if anything? I thought about plugging the sensor back in and just securing it to the top of the motor somewhere.
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
Fuel vacuum switch....???
There is a water in fuel sensor and one other sensor, but I don't know about a vacuum switch on the fuel bowl.
Did you leave the sensor plugged into the harness? If so, that is probably why you have a check engine light.
There is a water in fuel sensor and one other sensor, but I don't know about a vacuum switch on the fuel bowl.
Did you leave the sensor plugged into the harness? If so, that is probably why you have a check engine light.
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New User
Joined: Jan 2013
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From: Stillwater, OK
no I unplugged sensor and plugged hole in fuel bowl with the plug. The sensor was leaking pretty bad. I kept it just in case SHTF. It is the sensor that sets pretty close to the fuel pump. Can't really see it without taking the bowl out.
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New User
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From: Stillwater, OK
There is always a chance, but I went back over everything and double checked that I plugged in every sensor I took loose and also the ones that could have been wiggled loose or something. Everything seems to be plugged in and tight fitting. When I unplugged the sensor, shouldn't my fuel filter light come on in the dash?
FOREIGN GURU
Joined: Jul 2006
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From: Celaya, Gto. MX
There is always a chance, but I went back over everything and double checked that I plugged in every sensor I took loose and also the ones that could have been wiggled loose or something. Everything seems to be plugged in and tight fitting. When I unplugged the sensor, shouldn't my fuel filter light come on in the dash?
BTW welcome to the forum.
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
I don't have any sensors on my bowl. So it's hard for me to remember.
The CEL is probably coincidental for sure.
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Hotshot
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From: Newport, WA
There is always a chance, but I went back over everything and double checked that I plugged in every sensor I took loose and also the ones that could have been wiggled loose or something. Everything seems to be plugged in and tight fitting. When I unplugged the sensor, shouldn't my fuel filter light come on in the dash?
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FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
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From: Celaya, Gto. MX
that has the fuel vacuum switch located on the bottom of the bowl, towards the firewall.
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
Bottom line, though, no matter what year, of all the electrical connections on the fuel bowl (WIF, fuel filter restriction, heater), none are inputs to the PCM, right? So CE light's gotta be from something else. ICP is kinda nearby....
Senior User
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I too think my fuel vac switch is leaking all over the place. I too have micro cracks on exterior of fuel bowl.
When you talked about leaving the vacuum switch disconnected and plugging the hole you did reconnect the connection up on the right side right? the one the wiring harness connects to. I just want to make sure I put this thing back together again! thanks
When you talked about leaving the vacuum switch disconnected and plugging the hole you did reconnect the connection up on the right side right? the one the wiring harness connects to. I just want to make sure I put this thing back together again! thanks
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
I too think my fuel vac switch is leaking all over the place. I too have micro cracks on exterior of fuel bowl.
When you talked about leaving the vacuum switch disconnected and plugging the hole you did reconnect the connection up on the right side right? the one the wiring harness connects to. I just want to make sure I put this thing back together again! thanks
When you talked about leaving the vacuum switch disconnected and plugging the hole you did reconnect the connection up on the right side right? the one the wiring harness connects to. I just want to make sure I put this thing back together again! thanks
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Nov 7, 2013 11:51 AM