• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

P1260, fuel pump wiring or something

suitercrew

suitercrew

New member
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.

Sent from my LG-H901 using Tapatalk
 


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.

Sent from my LG-H901 using Tapatalk
 
Hmmmm, ok. For that code to trip, it needs to meet the improper voltage specs for 30 seconds...which leads me to believe there is something else going on.
 
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.

Sent from my LG-H901 using Tapatalk
 
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.
 


Scottydoggs said:
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.
Click to expand...
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.

Sent from my LG-H901 using Tapatalk
 
Ok I think I know what your talking about. From memory I think there's two rows of four wires to it?

Sent from my LG-H901 using Tapatalk
 
the fat one just past the dog bone mount. its touching the fpr.

limjob8-1.jpg
 
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

Sent from my LG-H901 using Tapatalk
 


its a weather tight plug, but that dont mean the pins cant get tarnished over time, if you got electrical parts cleaner, spray it down on both sides, then work the plug off and on a bunch of times, then di-electrical grease and work the plug off and on a few more times.
 
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.

Sent from my LG-H901 using Tapatalk
 
I installed the rewire last Thursday and erased the code. So far it hasn't come back up

Sent from my LG-H901 using Tapatalk
 


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
 
The thicker two wires are for pump power. The other wires are for fuel level sender. Do you hear the pump prime when you turn the key on/engine off?
 
You must log in or register to reply here.
Back
Top