Fuel pump not getting power so it won't start is it the ecu
4/30/20, 06:47 PM
#2
Legacy TMS Member
Yes. It could be.
But that's a very short answer for a big problem. There's a little less information than I'd like, but I'll take a stab at it.
You're asking about the fuel pump not getting power. Have you in fact done a multimeter check at the fuel pump to see if you have 12V at the pump? If not, you'll want to do that first. The connector should be just above the tank, in the rear, and visible. This won't check the fuel pump's power, but it will check the power at the connector to the fuel pump pigtail. Note that the fuel sender for the gauge is also in that connector, so please to be sure you get the *correct* pins. Wiring diagram on that.
(You may also use the fuel pump pigtail to try to run the pump directly, understanding that fuel delivery may happen, so be careful about that. And again, wiring diagram is pretty important here, don't wanna burn out something by accident... or explode...
)
If there's actually no actual 12V power, then you'll want to check the fuse, the relay if applicable, inspect the wiring all the way from the pump to the tank. It could be a bad connector somewhere, or a bad ground, or the wiring's been chafed/cut/corroded. It can be a very time consuming, irritating process. You'll really want a correct wiring diagram with not only the wiring involved shown, but locations of the connectors. It'll be a big help.
Other problems could of course be the ECU, either the connector, or the box, or something related, such as again, the fuses. Or the fuel cut off switch in the left rear corner of the trunk, it could be bad or need to hit the big red button to reset it. Yep, the big, shiny, *candy like* button. Can he resist? Can he not give in? CAN HE????
...er, sorry. Ren and Stimpy moment.
Press it. It's a good thing(tm) - Martha Stewart.
There's perhaps (not sure on these models) a fuel pressure switch that may be 'seeing' too high a pressure, which would be bad, so that'd have to be investigated and fixed if that's the case.
---
BUT... if there's power to the pump, then the pump should run. So that would mean the pump is likely bad, or it's clogged. Only one way to figure that out: take it out and replace it.
I think after all that, you'll want to post up more details about what you've done, symptoms you're experiencing. Like, does the engine turn over? Do you get fuel pressure at the engine? What year of car, engine type, even the transmission? More details will help greatly.
Let us know. Hope that helps!
And welcome to the forums! 
---
Related videos:
But that's a very short answer for a big problem. There's a little less information than I'd like, but I'll take a stab at it.
You're asking about the fuel pump not getting power. Have you in fact done a multimeter check at the fuel pump to see if you have 12V at the pump? If not, you'll want to do that first. The connector should be just above the tank, in the rear, and visible. This won't check the fuel pump's power, but it will check the power at the connector to the fuel pump pigtail. Note that the fuel sender for the gauge is also in that connector, so please to be sure you get the *correct* pins. Wiring diagram on that.
(You may also use the fuel pump pigtail to try to run the pump directly, understanding that fuel delivery may happen, so be careful about that. And again, wiring diagram is pretty important here, don't wanna burn out something by accident... or explode...
)If there's actually no actual 12V power, then you'll want to check the fuse, the relay if applicable, inspect the wiring all the way from the pump to the tank. It could be a bad connector somewhere, or a bad ground, or the wiring's been chafed/cut/corroded. It can be a very time consuming, irritating process. You'll really want a correct wiring diagram with not only the wiring involved shown, but locations of the connectors. It'll be a big help.
Other problems could of course be the ECU, either the connector, or the box, or something related, such as again, the fuses. Or the fuel cut off switch in the left rear corner of the trunk, it could be bad or need to hit the big red button to reset it. Yep, the big, shiny, *candy like* button. Can he resist? Can he not give in? CAN HE????
...er, sorry. Ren and Stimpy moment.
Press it. It's a good thing(tm) - Martha Stewart.There's perhaps (not sure on these models) a fuel pressure switch that may be 'seeing' too high a pressure, which would be bad, so that'd have to be investigated and fixed if that's the case.
---
BUT... if there's power to the pump, then the pump should run. So that would mean the pump is likely bad, or it's clogged. Only one way to figure that out: take it out and replace it.
I think after all that, you'll want to post up more details about what you've done, symptoms you're experiencing. Like, does the engine turn over? Do you get fuel pressure at the engine? What year of car, engine type, even the transmission? More details will help greatly.
Let us know. Hope that helps!
And welcome to the forums! ---
Related videos:
Last edited by houtex; 4/30/20 at 06:50 PM.
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