Fuel pump running with key off

[selliott]

So this new issue started the other day when i came out to a dead battery so I hooked the charger up and the fuel pump kicked on with the key off, I turned the ignition on and off a couple times to see if it would kick off but it stayed on. I have the caspers hotwire kit I replaced the relay thinking it might be bad but that wasn't it. I presently have the fuse pulled on the hotwire kit to shut it off. Any suggestions? My dd is at the body shop so I'm forced to drive my b1tchy Gp so I need to get this issue figured out.

[J57ltr]

Well something is turning on the relay. Did it ever work correctly?

[J57ltr]

If the Casper has its own relay is it positive or negative triggered?

[selliott]

Yes it worked for years. And I have no idea sorry

[J57ltr]

I'm not familiar with the rewire as I have always done my own since the amps are already back there so there's power. Then I use the stock fuel pump wire to turn on the "Hotwire" rewire. If you replaced the relay I'm assuming you meant the one in the fuse box. If so you will need a meter to check terminals 85 and 86 for power. You should have +12v on one and the other should be switched common (-12V) that is the turn on and off for the relay. If you turn the key on it should prime and go off after 2-3 seconds. If you don't get it to turn off the wire from the PCM may be shorted to ground. Check the harness that runs from the fuse box to the PCM it can get cut from the belt if the loom is loose.

[selliott]

I replaced the relay on the hotwire kit. I think the kit bypasses the stock one, I pulled the stock relay and it didnt do anything the pump still ran I will break out the meter tomorrow

[J57ltr]

It still ran without the relay installed?

[selliott]

Yes with the factory one under the hood but not when I pulled the one on the kit

[J57ltr]

So what triggers the relay on the kit? Is it possible for you to draw up a little schematic as there are at least a dozen ways to skin this cat when it comes to how to power the pump.

It would seem to me that you would use the factory fuel pump relay to turn on the kit relay. You could also just have it connected to an ignition hot (not recommended), you could even have it on a switch, in a ditch with a witch.... but I digress. There's a lot of ways to do it.

Jeff

[selliott]

Could it be the neutral safety switch? I put it in neutral and the pump shut off?

[selliott]

http://intense-racing.com/Merchant2/docs/102152.pdf here is the link to the instructions maybe better than me drawing a schematic

[J57ltr]

It sounds like the Casper's relay is bad and is sticking in the closed position. As it says in the instructions the factory fuel pump relay turns on the Casper's relay. Why it shut off when you shifted into Neutral is beyond me, and seems like it would just be coincidence. Ask yourself this: If you removed the fuel pump relay that turns on the Casper's relay how could the relay stay on? The only logical answer is either the relay is stuck closed (which happens occasionally) or or there is something going on with the wiring. I know for a fact that the factory relay's coil gets +12V from the ignition and that the other side of the coil is driven from the PCM. The relay sends 12V to the fuel pump. When you use this rewire, you are using the 12V that would normally turn on the pump to turn on the relay in the rewire. so at this point it would seem to me to be a bad relay. There may be other factors involved, but you have not made me aware of them.

Jeff

[selliott]

Jeff are you in Tomball TX? Yesterday i replaced both relays, I started with the factory one under the hood and when I pulled that one the pump should have shut off but did not. So you think its something in the wiring its self? I just took it out for a drive came back when I shut it off the pump stayed on when I put it back in neutral it shut off. I'm so confused. I'm sure it's a coincidence but that's twice.

[J57ltr]

Yup, but I work in Houston.

It sure seems to be a wiring issue, though I am not sure why putting it in Neutral would have any effect on shutting it off, unless there is some kind of feedback that is just enough to activate the relay in the rear. It may be a chaffed wire or something. Like I said I have always run fuel pumps off of my amp wiring since it's already back there. On 4X4's I usually have a main power wire to run for fans and such so I typically use that as well, plus I'm running all the wires anyway. This system I am not familiar with, but basically you should have a heavy gauge wire with a fuse near the front, a trigger wire for the relay. (I usually use a negative, but they are using positive from what I can tell), and a wire leading to the pump. The way I run something like that is:

87+86 B+
30 to pump
85 to switched ground.

The other way to run it is:
87 to B+
30 to Pump
85 to ground
86 to switched positive (for turn on)

[selliott]

I live presently in porter and work in Conroe. Come fix this pos lol. Ok here comes the stupid question what is the 87,30,85,86 numbers?

[Fivefingerdeathpunch]

Numbers refer to what they do on the relay.

[selliott]

Thanks cam. I just went out to check grounds and the pump was running tried the neutral trick didnt work so just 2 coincidences I pulled the factory relay again to see but that didn't shut it off so I just pulled the fuse.

[J57ltr]

Bring it over and I'll fix it. May be easier to bring it to the shop... I have AC here. I grew up in Conroe, and Porter isn't that far from Conroe down 1314.

Jeff

[selliott]

What does your schedule look like for the next few days? How much will you charge me for your trouble? Pm me your contact info.

[Dacton1985]

I really don't want to ask this question but I have to know. What's the point of doing this "hotwire" ?