10-08-2017, 02:13 PM
Join Date: Mar 2009
Location: Georgetown, Guyana
I'm temped to question the quality of the pumps that you are using.
Let me start by asking a few questions though - what style of pump are you using, what is it rated for (flow rate & pressure) and what burns on it.
The original pump would have been a "swimmer" pump, one that is submerged in the tank and is to some extent, dependent on fuel for cooling. If you are using a similar style of pump and it is rated for the required pressure, flow and method of regulation (in this case, bypass), I see no reason why they should burn.
The original pump is designed to run whenever the engine is running, if the ECU sees the engine stop, it will shut the pump off, there is no other interaction between the ECU and the pump, so unless you have a situation where you're running out of fuel and the ECU doesn't shut the pump off, I don't see any of the sensors as being involved.
The fuel pressure regulator is a fairly common "bypass" style, it regulates pressure in the fuel rail by allowing fuel in excess of the engine's requirements to bypass the engine and return to the tank - it's unlikely that it is related to the problem - but that is assuming that the pump is appropriately sized for the task.
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara - SQ420
05 - 2.0 Suzuki Grand Vitara - JB420
15 - 2.4 Kia Sportage