The idea behind this technology is to run the fuel pump at lower speeds while at idle and during cruising. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. The pump overheated and shut down. Join one more wire to the 85 terminal of the relay which acts as the ground wire. Your diagram will work fine, just be sure the switch fuse is only powered when the key is on ignition only. You could also use a pulse trigger switch for safety. Based on the responses I got from you ol' timers I have: 1 removed the toggle from the diagram allowing my ignition switch to trigger the relay.
I agree I'd shit can the toggle switch too. The factory wiring of the fuel pump is tied in with many other parts of the cars electrical system. Connect the other end of the 8-ga wire to the 30-amp fuse holder. Ok, so how do I do it right? I've seen too many relays stick on when the contacts weld together. It is a good rule to fuse all positive leads as close to the source as possible. The easiest way is to use an oil pressure switch. One wire goes to the pump, one to the start circuit, and the other to the ignition circuit.
I wouldn't run an inertia switch on a hot rod if somebody had a gun to my head. The pump started back up after it cooled down and we were trouble-free all the way there and back. I know that two are for the fuel guage, and at least two are for the fuel pump. Once, a buddy and me were going to a show in his '26 Buick roadster. Remember I'm are talking about old time hotrods and not modern streetrods with all those bells and whistles. The relay then provides a direct connection to the battery. Relays are used to take the big load off the switch and place the big load between the relay and the item being fed.
The first 55 years of my hotrod life we never used a relay. I am with you ,fuse,switch,good ground and drive. In the case of a horn, the horn button would be used to switch the ground lead 85 and power 86 would be provided directly from the fuse box. Tommy,I think the relay crap started when the auto maker brainiacs started putting the fuel pumps in the gas tanks. Low Oil Pressure Indicator You can get creative here, I have used a couple of different style of truck side markers, and may work depending on where they are mounted. We can use one to help with starting where we have no oil pressure built up yet. Diagnose Windstar fuel pump wiring Check both fuses Reset the inertia fuel cutoff switch Disconnect the connector at the fuel pump and check for power and good ground.
If you do not have a relay directly go to the fourth step. Wiring that will carry enough current. It supposedly will give you a little better pump speed and fuel pressure and make it give a more steady speed and pressure. But they don't have to be. When I went online to find a picture of the harness to see where the wire goes, the wiring is correct leading into the harness.
Conclusion This is a simple guide to safer wiring for your electric fuel pump. There are not many wires at the pump plug but as long as only one has 12v its not a power supply problem. We may be troubleshooting the same problem. See below if you want the deluxe version! In poking around the web I found the site. This 12v wire will now energize the relay to turn on.
We're going to show you how to install it and wire it up the correct way! They are usually labeled 30, 85, 86, and 87. How should you wire an electric fuel pump? Sorry, I was looking at the picture and didn't read the text. If you cannot locate the relay get the help of your usual mechanic. The article I read explained how the pumps are tested at 14V, and how at a given pressure my Walbro 255 hp won't actually flow 255lph at only 11. Example: - If you take 85 to ground than make 86 your 12v signal in. You want to limit voltage drop by using a heavy gauge wire.
Tip: Screw into metal to ground, not through it. A carbed engine will stall from a rollover leaving the vehicle on it's roof. Had one of these damned things fall apart under the dash of a 66 Coronet once. Which wires should I check for continuity? With it disconnected I could not start my truck despite it cranking over. That will kill the pump.