No. The oil pump will close with enough pressure, allowing the engine to run without the relay working. Many people think it's a fuel cutoff for safety reasons, it's the exact opposite.
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
Fuel pump and fuel pump relay. -SOLVED
- Thread starter Pecmoney
- Start date
So if I go outside and unplug the FP relay with the truck running it will not stall? The FP is powered independtly by both the relay and the ECU (via the oil switch)?
This I got to see on a schematic to believe it.
Now this I would believe, FP relay work for first couple of seconds, then it hands it over to ECU that must see Oil Pressure to continue feeding the fuel pump circuit.
To have 2 independent feeds for the FP all the time makes no sence.
To have 2 independent feeds for the FP all the time makes no sence.
Look at the wiring if you will. The relay and oil pressure switch are in parallel, not series. One does not have to operate for the other to work. Why would GM run an oil pressure switch ($$ and complexity) for no reason? There is no oil pressure input to the ECM.
Here, link to typical TBI fuel pump wiring: http://ww2.justanswer.com/uploads/amedee/2009-10-22_152650_1.gif
Here, link to typical TBI fuel pump wiring: http://ww2.justanswer.com/uploads/amedee/2009-10-22_152650_1.gif
Last edited:
