too many dead fuel pumps...

[dankz318i]

So i just got a new fuel pump less that 2 months ago and it died. I replaced the existing one before it went out but it was screaming like it was nearly ready to seize and i'm certain it's a sensor but i'm not 100% which one. the names are so misleading as to which one has influence on the amount of fuel the pumps are meant to deliver.

I added a new pump, still screaming
I added a new fuel pump relay... till screaming
I checked both in take and main pump, both are fine.
lastly I just made a jumper and was able to manually jump from low pressure to high pressure...

I am guessing that it's a temp sensor of some sort but I can't figure out which one. even pelican parts has such a general description of the parts that i can't tell which one it is. I hooked up a air/fuel meter and i'm running very rich... check the vacuum to the pressure regulator, added a new hose. i'm not sure what to try next.

thanks for any help in advance. damn thing is starting to get expensive.

[Sagaris]

Have you replaced your fuel filter? Is there junk in your gas tank which could clog the pickup and burn the pump out. I would believe that if the pump failures aren't just a coincidence, that there is a blockage in one of the fuel lines, filter, or pickup which is causing the pump to die. That goes against what you say about the engine running rich though. A clogged fuel tank return line (from the fuel pressure regulator to the tank, would cause rich running, assuming it isnt a vac. leak, bad oxygen or coolant temp sensor, or afm causing the rich condition.

I am not an expert by any means, but that is what comes to mind.

[Hey_You]

Yeah, if your pumps are screaming, and are known new, then I would imagine they are being strained (blocked filter, or pickup) and if you are running rich, then that opens a new door. Common problem is the coolant temp sensor, they are cheap, buy a new one. Also if you are running rich, check your intake boot, if it's loaded with fuel, suspect your cold start injector (which is in conjunction with your coolant temp sensor, so replace sensor before that injector)

[dankz318i]

Have you replaced your fuel filter? Is there junk in your gas tank which could clog the pickup and burn the pump out. I would believe that if the pump failures aren't just a coincidence, that there is a blockage in one of the fuel lines, filter, or pickup which is causing the pump to die. That goes against what you say about the engine running rich though. A clogged fuel tank return line (from the fuel pressure regulator to the tank, would cause rich running, assuming it isnt a vac. leak, bad oxygen or coolant temp sensor, or afm causing the rich condition.

I am not an expert by any means, but that is what comes to mind.

the problem i have is that i am losing fuel pressure upon the motor starting and running. i ordered a new in tank pump just for shits and will be doing a vacuum test on the fuel lines to see if they are pulling air in from somewhere. hopefully i will start to get somewhere soon.

btw, i checked the cold start valve and it's not a worry. tested the regulator... no issue. i'm at a loss unless i have injectors that are flooding or something. i'm considering anything at this point. going to replace the coolant temp sensor.