Looking for part number......
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From: Morenci, AZ
Looking for part number......
I broke the hose nipple off of the vacuum switch for my "Fuel Economy" light today while replacing hoses......Now it's on all the time, and I could just pull the bulb, but I like my little dash mount big brother.
Does anyone know a part number, or where I might obtain a new one?
Does anyone know a part number, or where I might obtain a new one?
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From: Simi Valley, CA
Originally Posted by AZ_Catskinner
I broke the hose nipple off of the vacuum switch for my "Fuel Economy" light today while replacing hoses......Now it's on all the time, and I could just pull the bulb, but I like my little dash mount big brother.
Does anyone know a part number, or where I might obtain a new one?
Does anyone know a part number, or where I might obtain a new one?
Thread Starter
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Senior User
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From: Morenci, AZ
It's not for the Merc, it's for the F100. There's a little blue/white vac switch mounted to the firewall for it, and an orange "Low Fuel Economy" indicator on the dash.
It actually (before I broke it) seemed to work pretty well - it'd kick in any time I was giving a bit too much on the stupid pedal, kind of like the upshift light on newer models.
I'm thinking I may have to find a piece of small tubing and sleeve it back together, since I can't seem to find a reference to it in any of the normal parts websites.
It actually (before I broke it) seemed to work pretty well - it'd kick in any time I was giving a bit too much on the stupid pedal, kind of like the upshift light on newer models.
I'm thinking I may have to find a piece of small tubing and sleeve it back together, since I can't seem to find a reference to it in any of the normal parts websites.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by AZ_Catskinner
It's not for the Merc, it's for the F100. There's a little blue/white vac switch mounted to the firewall for it, and an orange "Low Fuel Economy" indicator on the dash.
It actually (before I broke it) seemed to work pretty well - it'd kick in any time I was giving a bit too much on the stupid pedal, kind of like the upshift light on newer models.
I'm thinking I may have to find a piece of small tubing and sleeve it back together, since I can't seem to find a reference to it in any of the normal parts websites.
It actually (before I broke it) seemed to work pretty well - it'd kick in any time I was giving a bit too much on the stupid pedal, kind of like the upshift light on newer models.
I'm thinking I may have to find a piece of small tubing and sleeve it back together, since I can't seem to find a reference to it in any of the normal parts websites.
Ford Parts Specialist
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From: Simi Valley, CA
Originally Posted by AZ_Catskinner
If it makes you feel any better, it's the only one I've ever seen too. It's where the seatbelt light normally is on the cluster.
Last edited by NumberDummy; Jun 1, 2007 at 11:48 PM.
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From: MD
I've heard about that idiot "Low Fuel Economy" light was due to the oil crisis of '73-'74. I think Ford only put that on trucks in '74 and '75 model years. It does nothing expect monitor engine vacuum.
The blue/white thing sounds like a delay valve commonly found on later years. My '79 has two of them.
The blue/white thing sounds like a delay valve commonly found on later years. My '79 has two of them.
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From: Simi Valley, CA
Originally Posted by Jermafenser
I've heard about that idiot "Low Fuel Economy" light was due to the oil crisis of '73-'74. I think Ford only put that on trucks in '74 and '75 model years. It does nothing expect monitor engine vacuum.
The blue/white thing sounds like a delay valve commonly found on later years. My '79 has two of them.
The blue/white thing sounds like a delay valve commonly found on later years. My '79 has two of them.
A delay valve isn't a switch..I know what a delay valve looks like...it's this little bugger I want to see...then I can verify with the OP.
Last edited by NumberDummy; Jun 1, 2007 at 11:55 PM.
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From: Morenci, AZ
Originally Posted by Jermafenser
I've heard about that idiot "Low Fuel Economy" light was due to the oil crisis of '73-'74. I think Ford only put that on trucks in '74 and '75 model years. It does nothing expect monitor engine vacuum.
The blue/white thing sounds like a delay valve commonly found on later years. My '79 has two of them.
The blue/white thing sounds like a delay valve commonly found on later years. My '79 has two of them.
It's wholly unneccessary, but I intend to keep this truck both functioning, and looking as close to it would have new as I possibly can - even undoing the damage of the 70's CB radio craze (not one, but three large antenna mounting holes occupy my cab, with bad mostly Bondo repair work).
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From: Simi Valley, CA
Originally Posted by AZ_Catskinner
It's not like a regular delay valve - it's got it's own little mounting bracket, and a wiring harness hanging off of it. The whole thing is around ¾" diameter, and maybe an inch or so long.
It's wholly unneccessary, but I intend to keep this truck both functioning, and looking as close to it would have new as I possibly can - even undoing the damage of the 70's CB radio craze (not one, but three large antenna mounting holes occupy my cab, with bad mostly Bondo repair work).
It's wholly unneccessary, but I intend to keep this truck both functioning, and looking as close to it would have new as I possibly can - even undoing the damage of the 70's CB radio craze (not one, but three large antenna mounting holes occupy my cab, with bad mostly Bondo repair work).
Last edited by NumberDummy; Jun 2, 2007 at 12:12 AM.
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From: Morenci, AZ
Sounds exactly like the one! I ran out and measured the harness, and it's right at 4 7/8", so I'm betting that's the ticket!
Again, I really appreciate the effort you've put into this!
Again, I really appreciate the effort you've put into this!
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From: MD
Ahh, so it has a wire going to it? Interesting. I've always find that Low Fuel light wonderful. It really speaks out about the Arab oil crisis. I've seen the instrumental cluster with it on eBay once. What color does it glow? IIRC it was amber?
I rarely see 73-77 pickups, 78-79s are all I find in my area.
Ha! I have the 1979 truck wiring diagram book. Two inches thick. Hard to read it with letters in it as small as an ant.
I rarely see 73-77 pickups, 78-79s are all I find in my area.
Ha! I have the 1979 truck wiring diagram book. Two inches thick. Hard to read it with letters in it as small as an ant.