FL5 Fuel Pump Relay Location

[hdhillon90]

Hey Guys,

Hope you all are well. I'm looking into getting a kill switch for my '25 FL5 and I need some information on the Fuel Pump Relay. Unfortunately, the owner's manual and the fuse box are not helpful at all. I'm talking to someone at 4122 inc and they said the relay might be called PGM-FI MAIN RELAY 2 but it is nowhere to be found. I was told it is possibly this blue one but the fuse box diagram is so confusing, i can't actually tell what relay this is. Any experts that can help? See attached photos

 

[jedi03]

With these motors also using a mechanical pump would it be better to do a starter or injector kill?

 

[PrecordFK7]

Yes, the blue one circled is the one you'll need to replace with the 4122 kit's to hook up the fuel pump kill switch.

 

[Amm5890]

it should be the PGM main relay 1. its a brick color.

 

[PrecordFK7]

I have the 41TwentyTwo kill switch hooked up and replaced the blue relay fuse with the 41TwentyTwo supplied relay. Fuel pump kill switch works as intended on my car.

 

[Amm5890]

I have the 41TwentyTwo kill switch hooked up and replaced the blue relay fuse with the 41TwentyTwo supplied relay. Fuel pump kill switch works as intended on my car.

If the blue one is confirmed to work I would just go with that one OP.
Curious to where you ran it into the cabin. I see a blank grommet just about the hood release and was thinking that on but it’s kind of a pain to get to and I don’t know if I want to poke a hole through the big one behind the battery

 

[ctechauto]

it should be the PGM main relay 1. its a brick color.

No, relay 1 is starter, injectors and ignition coils. Relay 2 (blue in his pic) is fuel pump.

 

[zumbooruk]

Hey Guys,

Hope you all are well. I'm looking into getting a kill switch for my '25 FL5 and I need some information on the Fuel Pump Relay. Unfortunately, the owner's manual and the fuse box are not helpful at all. I'm talking to someone at 4122 inc and they said the relay might be called PGM-FI MAIN RELAY 2 but it is nowhere to be found. I was told it is possibly this blue one but the fuse box diagram is so confusing, i can't actually tell what relay this is. Any experts that can help? See attached photos

I purchased the same 4122, and also was not able to figure out which relay to us. I also could not figure out how to get through the firewall... so it is still sitting in my goodies box of stuff to be installed

initial response from 4122 (they were super quick to reply)

The PGM-FI relays control the fuel injectors and Fuel Pump. Pull out the PGM-FI Main Relay 2 (which should control the Fuel Pump itself) and try to start your vehicle. If it just cranks and does not start, that should be the right location (the Kill Switch bypass relay mimics pulling out the relay physically) to replace it with the Bypass Relay. Hope that makes sense. Let me know.

so I pulled the OEM relay (PGM-FI Main Relay 2, the blue one) and was able to start the car and it kept running (I turned off the engine after about two minutes)

when I reported the above, I got this reply from 4122:

Have you tried pulling out the PGM 1 relay? Sometimes they work in conjunction but one of them has more control over the fuel pump.

but I have not tried PGM 1, since I could not figure out how to get through the firewall, and so the kill switch is still in my "to be installed box"

 

[PrecordFK7]

Even if you pull PGM-2 the car will still start and run for a little bit. It's when all the fuel in the lines is exhausted the car will die and throw the Christmas tree off lights on the dash. I like the way it works because if someone were to steal the car they could start it, drive a block or two and then the car would die, they'd panic and likely ditch the car.

 

[ctechauto]

I purchased the same 4122, and also was not able to figure out which relay to us. I also could not figure out how to get through the firewall... so it is still sitting in my goodies box of stuff to be installed

initial response from 4122 (they were super quick to reply)

so I pulled the OEM relay (PGM-FI Main Relay 2, the blue one) and was able to start the car and it kept running (I turned off the engine after about two minutes)

when I reported the above, I got this reply from 4122:

but I have not tried PGM 1, since I could not figure out how to get through the firewall, and so the kill switch is still in my "to be installed box"

PGM 1 controls the injectors, starter and ignition coils. There will be fuel in the lines so it would still start and idle until it dies. PGM 2 controls fuel pump.

 

[ctechauto]

Even if you pull PGM-2 the car will still start and run for a little bit. It's when all the fuel in the lines is exhausted the car will die and throw the Christmas tree off lights on the dash. I like the way it works because if someone were to steal the car they could start it, drive a block or two and then the car would die, they'd panic and likely ditch the car.

lol you beat me to it by like 30 sec

 

[Amm5890]

So could either or work? Or PGM 1 is just a no go. Someone else in the forum said it worked for them so i based my previous comment off that. If PGM 1 is the starter wouldn't it just not start at all?

 

[PrecordFK7]

I'm not sure if the pass through fuse provided by 41TwentyTwo will work in the PGM-1 slot or not. I haven't tried it, but believe they are different and not interchangeable.

 

[hdhillon90]

No, relay 1 is starter, injectors and ignition coils. Relay 2 (blue in his pic) is fuel pump.

Awesome thanks for this! Is this from the service manual? This diagram lines up with their reccomendation so glad that's the same.

One thing that wasn't clear to me based on previous responses, will the car still start once I pull the relay out or it should not start at all? My expectation is taht with the kill switch, car only starts once the relay is enabled.

 

[PNEUMA]

Awesome thanks for this! Is this from the service manual? This diagram lines up with their reccomendation so glad that's the same.

One thing that wasn't clear to me based on previous responses, will the car still start once I pull the relay out or it should not start at all? My expectation is taht with the kill switch, car only starts once the relay is enabled.

If you pull the blue one (the correct relay) the car will start and run, but not for long. I have verified this with my poor memory. My car lives with the relay removed, more than it does with it installed.

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