460 Electrical Fuel Pumps Starter Relay

[kramttocs]

Sorry Scott, what blue wire?

THE blue one of course

Had actually thought I'd referred to it in more detail in the first post but looks like I didn't.

This is the blue one that connects to the starter relay. Fuse Link T. Looks like it turns into PK/BK after the fuse but that is under my aluminum plate so can't visually confirm.

*little side question - can a hyperlink be added to the top of the individual EVTM pages that allows one to go back to the EVTM topic page? The back button usually works but I often go to these pages from my search history. Not a big deal.

[Gary Lewis]

THE blue one of course

Had actually thought I'd referred to it in more detail in the first post but looks like I didn't.

This is the blue one that connects to the starter relay. Fuse Link T. Looks like it turns into PK/BK after the fuse but that is under my aluminum plate so can't visually confirm.

*little side question - can a hyperlink be added to the top of the individual EVTM pages that allows one to go back to the EVTM topic page? The back button usually works but I often go to these pages from my search history. Not a big deal.

I'm confused. I assumed you have an ammeter and the schematic below would be the correct one. And there is a blue fuse link, but it is Fuse Link S, not T. And it is yellow not pk/bk. So I'm lost.

And, that can't be disconnected as you shouldn't be able to get the truck started since it provides power to the fuel pump.

As for a hyperlink, if you use the '85 EVTM there is one called Index at the top of each section. Is that what you mean?

[kramttocs]

I'm confused. I assumed you have an ammeter and the schematic below would be the correct one. And there is a blue fuse link, but it is Fuse Link S, not T. And it is yellow not pk/bk. So I'm lost.

And, that can't be disconnected as you shouldn't be able to get the truck started since it provides power to the fuel pump.

As for a hyperlink, if you use the '85 EVTM there is one called Index at the top of each section. Is that what you mean?

The 1985 EVTM links are even better than I was thinking of! I always go to the 86 so hadn't ever seen those.

---

We are almost on the same page

First, I am planning to hook everything back up like factory so just curious about the workings of it since it wasn't hooked up when I got it.

Yes, the battery side fuse link S that ultimately makes its way to the fuel pumps via the relay (triggered by oil pressure switch) was always connected.

It's the 'HOT IN START' fuse link T that wasn't (second photo you posted). I believe this primes/fills the carb until the oil pressure is enough to trigger the switch and then fuse link S takes over.

So guessing that if you crank it long enough the pressure will build up (even before the engine is running) and cause the fuel pumps to kick in via fuse link S.

 

[kramttocs]

The 1985 EVTM links are even better than I was thinking of! I always go to the 86 so hadn't ever seen those.

---

We are almost on the same page

First, I am planning to hook everything back up like factory so just curious about the workings of it since it wasn't hooked up when I got it.

Yes, the battery side fuse link S that ultimately makes its way to the fuel pumps via the relay (triggered by oil pressure switch) was always connected.

It's the 'HOT IN START' fuse link T that wasn't (second photo you posted). I believe this primes/fills the carb until the oil pressure is enough to trigger the switch and then fuse link S takes over.

So guessing that if you crank it long enough the pressure will build up (even before the engine is running) and cause the fuel pumps to kick in via fuse link S.

Turns out the blurb on 106 of the 86 EVTM gives some detail on it.

[Gary Lewis]

The 1985 EVTM links are even better than I was thinking of! I always go to the 86 so hadn't ever seen those.

---

We are almost on the same page

First, I am planning to hook everything back up like factory so just curious about the workings of it since it wasn't hooked up when I got it.

Yes, the battery side fuse link S that ultimately makes its way to the fuel pumps via the relay (triggered by oil pressure switch) was always connected.

It's the 'HOT IN START' fuse link T that wasn't (second photo you posted). I believe this primes/fills the carb until the oil pressure is enough to trigger the switch and then fuse link S takes over.

So guessing that if you crank it long enough the pressure will build up (even before the engine is running) and cause the fuel pumps to kick in via fuse link S.

Ahhh! Dawn! Marblehead! Yes, we are now on the same page.

Yes, Fuse Link T provides power to the pump while cranking. But if you crank it long enough the oil pressure should come up and, if there is sufficient battery power left, the pump will fill the carb.

So, it should be hooked up, for sure.

[Gary Lewis]

Turns out the blurb on 106 of the 86 EVTM gives some detail on it.

Yep.

[kramttocs]

if there is sufficient battery power left

Haha very good point.

Mystery solved

[gotfords]

Turns out the blurb on 106 of the 86 EVTM gives some detail on it.

Yep.

so i have now a 84 f250 460 dual tanks...where is fuel pump relay?

where is inertia switch?

thanks

[kramttocs]

so i have now a 84 f250 460 dual tanks...where is fuel pump relay?

where is inertia switch?

thanks

The fuel pump cut off relay is to the right of the brake booster when looking from the front of the truck. There is a square-ish plastic cap screwed to the firewall that the relay snaps into from underneath. Note that this can hold two relays so it's a good location to add another (or move the trailer relay to) and keep it looking clean.

The inertia switch is inside the cab on the passenger side of the hump. There is a square cutout in the firewall pad. Little square box with a white rectangular push button on it.

[85lebaront2]

The fuel pump cut off relay is to the right of the brake booster when looking from the front of the truck. There is a square-ish plastic cap screwed to the firewall that the relay snaps into from underneath. Note that this can hold two relays so it's a good location to add another (or move the trailer relay to) and keep it looking clean.

The inertia switch is inside the cab on the passenger side of the hump. There is a square cutout in the firewall pad. Little square box with a white rectangular push button on it.

First I will address the blue wire, it is a "priming" wire and goes to the NC side of the fuel pump relay. It's purpose is to power the selected fuel pump when cranking to fill the float bowls. I used to cheat when Darth still had the carburetor, if he had been sitting for a while, I would open the hood, take the blue wire off it's terminal and touch it to the battery side of the starter relay, I would listen for the change in sound of the fuel flow indicating the float bowls were full.

Wiring, I am using the 1995 battery cable set Jim salvaged for me, it uses the standard Ford starter relay, but it only powers the starter solenoid on the factory PMGR starter (I refuse to pay an exorbitant price for a starter when Ford has a perfectly good one). I have been using this setup since my son sourced me a late model PMGR starter probably 20 years ago after the original 1986 Ford moveable pole piece one died. I did have to replace it about a year ago, and was able to obtain another Precision Certi-Pro one locally. Pasco out of Salisbury MD bought the Precision line when they went out of business.