Thread: P1260, fuel pump wiring or something

Was out on a drive tonight and did a wot pull up to about 90 and this code popped up as pending. Fuel pump is about a year old. The only thing I have changed recently is I upgraded to 60# injectors and am still dialing in the tune. Currently my fuel trims are still pretty off -10 to 0 ltft. I've been worried I'm maxing out my current pump as I'm on a 3.4 e85 setup and the pump I have is a Delphi that is for a gt which when researched seems to flow less then the supercharged models.

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I have a caspers one sitting in my room waiting to be installed im just planning on getting a better pump, switching the connector to the 4 flat style and doing the install together. Currently it's all stock wiring. No alt booster, or alt rewire or anything like that either.

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Well it's nice you know why it actually sets. Online it pretty much just says your pcm, fuel pump, or wiring is messed up. What I wasn't sure off is if this code would set if maybe i was maxing out the pump. I've had a kr problem but it's only ever happened in the very top of 2nd or 3rd making me think maybe it's a fueling thing. I should probably be watching my wideband when this happens but I'm always to busy watching the road during wot pulls.

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Originally Posted by Scottydoggs

you got that fat plug on the front of the engine from the coil harness/ cam harness. mine got dirty i guess and was causing the fuel pump to quit. i would get up to 3 codes, 3x signal, crank and something else from it.

cleaned that plug added some grease and aint had a issue since. its a free repair at least if thats not it.

Are you talking about the icm plug? Unrelated I've been getting a p0300 code on long highway trips. Only highway though, I don't notice these supposed misfires either. Might try changing out the icm since I have a spare.

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Ok I think I know what your talking about. From memory I think there's two rows of four wires to it?

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Ok that's the one I was thinking of. I'll try to clean it out. I know it's really dirty. Everything in the stupid injector valley is dirty

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Checked that plug and it was spotless. 😯

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Ya I'll be installing the rewire probably next week. So far the code is still pending and I've gone on about 3 "trips" so it'll either set the light or go away pretty soon here. My car has a habit of popping codes one time and then they disapear never to be seen again.

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I installed the rewire last Thursday and erased the code. So far it hasn't come back up

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I bought a fuel pump for a 99gt and never installed did l67 engine swap and tuned pcm from zzp installed got car running but doesn't start unless with starter fluid but I got the p1260 one site said it's a fuel pump wiring or speed control but I installed the new pump and I got the 1260 code is it cuz it's a gt fuel pump and the pcm is a l67 tune

Could I have messed up the wiring it wasn't color coded with the same colors just the black n grey wire matched and the other 2 were blue and black with white line thru black and orange with white stripe and solid black

Yes I do hear the engine prime it send the fuel to the rail the rail is leaking from the valve