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  #1  
Old 11-25-2007, 03:32 PM
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Vacuum Switch

1997 F350 7.3 P.S. I have a fuel leak from the vacuum switch (had a small crack) that screws into the fuel recirculation module located on the right side of the fuel filter housing on top of the engine. Also the threads were stripped where it screws in so I had two leaks, one in the module and one in the split switch so I had to J B Weld it to stop the leaks but don`t know if the switch is bad. Does anyone have an idea what this switch does and if the engine would run properly without it or how to test the switch without removing it? Thanks.
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Old 11-26-2007, 05:45 AM
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You may want to post this in the OBS section it may get more replies. This is the 99 and up section.
NCHornet
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Old 11-26-2007, 09:29 AM
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To NC HORNET

Thanks to NC HORNET
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Old 12-20-2007, 06:17 PM
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I just tested mine tonight!!! I am not sure what the function of the switch is besides turning on the fuel filter light on the dash, I dont know if it has a direct result linking it to the computer. But here it is, The switch connects at 7 inHG. It will read open on a meter, with no vaccum, but by taking my Mighty Vac bleeder pump, it would go click closed at 7 inHG. I also bought a new one from the dealer, and tested it, Ford part # E8TZ-9S283-A, and it functions the same way, so I did some fancy surgery heating a butter knife to reseal the package so I can take it back tommorrow.
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Old 12-20-2007, 06:20 PM
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mine was leaking fuel through the electrical plugin. It cost me bout 70 bucks at ford for a new one.
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Old 12-21-2007, 04:42 AM
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$37.35 unless my parts dealer is giving me a deal on parts?
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Old 12-27-2007, 11:43 AM
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Mine was leaking fuel through it too. I sealed it with JB Weld, works fine. Thanks, guys for the replies.
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Old 10-16-2014, 09:55 AM
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AFBLUE,
I want to thank you for the vacuum tests you did on two different fuel vacuum switchs, Ford part #E8TZ-9S283-A ( International part #1809435C1). The information you provided was very helpful to me. I searched unsuccessfully until I found your post, to find the vacuum value (W.C., inches water column, Hg) that this factory switch pulls. I was very impressed that you not only tested your switch on hand but actually went to the trouble to go to the dealer and buy a new switch for testing. I do hope the dealer refunded your money. By your testing now we know that the switch tests 7" W.C. This is the value at which the fuel filter restriction would have to be in order for the switch to activate and the light on the dash would come on. In my opinion, people that would remove this valuable sensor and plug the hole with a pipe plug are only asking for trouble down the road, i.e. injection pump problems or injector problems. This simple sensor although it may require replacing from time to time is valuable in giving a heads up to filter restrictions that could cause other problems. I suppose people would rather buy a new injection pump or injectors rather than replace this sensor. Thanks again, brooks12307
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