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Unlikely the breaker is faulty, but it is possible.
Most likely the pump is consuming too much current or more current than the breaker is designed to cope with.
A fuel pump is simply a pump driven by a motor that is designed to provide a greater volume of fuel than the engine could ever need right from the initial startup to maximum load and speed. It is the fuel pressure regulator that provides the chosen fuel line pressure and fuel constantly circulates at that pressure therefore the current the pump motor consumes remains constant regardless of the engine speed or load.
Should there be a fuel line blockage, for instance, any healthy pump will be capable of generating a pressure sufficient to burst many types of fuel hose/pipe and it is only when something like that happens or an adjustable fuel pressure regulator is used that is adjusted for a greater than design pressure that the pump will work harder and consume more current.
I suggest you check the fuel line pressure and adjust or replace the regulator if it is significantly higher than specification and then measure the current being consumed by the pump if the breaker is still tripping. If the current is within limits replace the breaker and if the current is excessive you should seek guidance from the people who rebuilt it.
Your vehicle has no fuel pump relay . Has a fuel pump flow control module .
Fuel Pump Flow Control Module (FPCM)
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal.
Plus it has two fuel pumps !
The high pressure fuel pump (9) is a mechanical one cylinder design driven by an eccentric on the exhaust camshaft (1) of bank 2. High pressure fuel is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a magnetic actuator which controls the inlet valve of the high pressure pump. The ECM provides battery voltage on the actuator high circuit and ground on the actuator low reference circuit. Both circuits are controlled by the ECM. When the ECM deactivates the FRP regulator, both circuits are disabled and the inlet valve is held open with spring pressure. When the ECM activates the FRP regulator, the low circuit driver connects the low reference circuit to ground and the high circuit driver pulse-width modulates (PWM) the high circuit. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the FRP regulator with the position of the eccentric on the camshaft. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail. The high pressure fuel pump also contains an integrated pressure relief valve.
Your best bet is have it towed to the dealer , you don't want to mess with the high pressure pump .
fuel pressure regulators are normally located in the fuel manifold. They are either vacuum controlled or electronic controlled to maintain the right fuel pressure for engine requirements and to shut off the fuel pump when the ignition is turned off
If your manually adjusted unit will not do all that then you are asking for fault codes to appear and all sorts of problems to occur
First, did you check the fuel filter to see if it was clogged (cheap fix to replace it if you haven't recently)? Second, there's a fuel pressure regulator at the back of the tpi rail (back by the distributor). This has a diaphragm and spring in it. If the diaphragm leaks, the fuel pressure will be erratic. If you're going to check the diaphragm, I'd recommend installing an adjustable fuel pressure regulator where the stock (non-adjustable) fuel pressure regulator is at. The rail also has a bleed down circuit which will drop the fuel pressure once the vehicle is shut off. Third: the in-tank fuel pump could be on the way out.
Sounds like a bad pressure regulator. The regulator is suppose to adjust the pump speed to match demand. Some units work by counting the RPM with a crankshaft sensor. Check fuel pressure at test port. Sometimes the pressure needs to be adjusted when changing a pump.
It is normally in the fuel manifold rail ( at the ends or the middle) . It will have a hose from it back to the tank. IT is normally a tin made item and is sometimes adjustable but most are pre-set. It may even have a wire or two coming out of it for the pressure sensor.
That screw is probably the pressure regulator adjustment screw, this screw is to adjust fuel pressure.
Regulating fuel pressure is very important in newer engines.
Suggest going to shop good with fuel pressure problems. Not easy fix for a DIY.
First, I have never seen an S-10 Blazer that is carbureted and equipped with an in-tank fuel pump and a fuel pressure regulator. Are you sure you are not talking about a throttle body injected engine?
Then, even if such a vehicle does exist, it would make sense to me that the pump is either capable of producing the pressure or it is not. If it adjusts to where you want it, it would make sense to me that the pump is doing what it is supposed to do. Adjusting the regulator would not cause the pump to pump more. It would only affect how much of what the pump is pushing gets returned to the tank. On the other hand, a hole in a regulator diaphram that keeps getting larger could easilly cause the symptoms you are describing.
if carburetor check carb float level if injected it could need the fuel pressure regulator adjusted you may need an after market fuel pressure regulator even with a carb especially if its not the stock fuel pump
If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.