Isuzu Rodeo 99 pump pressure

Hello Nestito Collaboration
I have a problem with the Isuzu Rodeo 99 with a 4 -cylinder engine 22se I do not find the specification of the fuel pump either in pounds or bar, since when putting the key on * on * I mark me 20 pounds and does not maintain, already with the engine lit 35 pounds, in advance thanks.

Hello everyone, Sorto73 , those multipoint injection systems, for the year it should be with return and pressure regulation. The pressure values ​​move between 2.5 to 3.0 bar depending on the depression that exists in the multiple of admission, that is why I had to have approx 2.5 bar, if you give an abrupt peer to the engine the pressure had to climb to 3 bar and then return to 2.5 when the engine is in idle.
It is observed in its post that when giving contact, it only reaches 20 psi (1bar approx 14.7 psi) and it is not maintained ... if the pressure falls there may be problems in the pressure regulator or the check valve (antiretorne) in the pump. If you pins or obstruct the return output from the regulator to the fuel tank and the pressure rises or maintains, it is the regulator that is causing you the problem, if the return is not maintained foreigner ... pump.
Going to another issue I read about the P1 code ..., I have seen several sees the same code in Izusu and GM, it refers to the fact that the ECU Motor detects an internal problem in the conversion faces digital analogo, you know, the ECU only processes digital signals, therefore it must transform all the analogy entry sñales to digital language. Look I have seen echus with that code and turned out to be in most cases ground connection or dough problems or tension drops proven by bad contacts in the battery feed stages of the ECU or engine computer .. It can also be an internal problem of the ECU, but it is much more rare ... well I wish you luck. Kind regards.

Thanks are the tests I hope everything is well then commented on the results

Hello problem solved, the entire fuel system was checked where the pump was replaced and cleaned the fuel rail next to the pressure valve opting a 40 -pound response in relief and accelerating 45 pounds, as regards the code problem, the ECM connector and battery terminals are cleaned, the battery is also changed since it marks 12.15 volt without any action but in Star low to 10.40 volt, thanks for The very probecoso contribution.

Hello everyone, thanks to you Sorto for sharing the solution to a problem, very interesting as an old battery or a problem in the load system can produce malfunctions inside the ECU ... and in my opinion it confirms the value that the diagnosis system has on board a modern car when diagnosing, you imagine that kind of failures without the help of the obd ... And/or diagnosis logic of failures that have modern control units, as well as their sensitivity and extreme speed to detect changes or give orders to the different actuators, it is undoubtedly a topic that in my opinion is recently beginning, recurrently I think that we will be in these issues within about 300 years, in short for me a fascinating theme that characterizes us as a race, the eternal seeks of perfection.