Help Everyone. Kabibili ko lang ng 1990 AE92 with a 4AGE engine last January. But lately I have noticed that the car has been having some slight hatak issue. I noticed that in lower gears 1st, 2nd and 3rd gear changes, pag pick-up ko feel ko na parang na sho-short ang gas supply. But the engine doesn't die, parang mag short or loss power lang sya temporarily then it will recover naman. At idle the engine is okey. Kung mag-revolution ka naman at stationery lang ang kotse nothing seems to be bad. Lumalabas lang paminsan-minsan pag nag change gears ka from 1st to 3rd but more common sya sa 2nd to 3rd.

For an overview and to those who think na posible that this could be a fuel pump issue, i'll give a brief description. The car's fuel pump is mounted right inside the engine compartment just by the wall nung wheelbox sa front left. Sabi ng iba this is wrong mounting or set-up raw. They said the pump should be a submersible type. Mine raw is a suction type of fuel pump (from mercedez), and malamang this could be it. Its possible raw the pump is not able to suck 100% fuel. The pump's pressure has been gauged already. Pressure reading at idle is about 35psi. Sabi ng mekaniko okey raw ito. Medyo malikot lang yung needle ng gauge which the mechanic thinks hindi normal or tama. The gauge's needle should be steady lang raw.

When the problem occurs I was also thinking that the fuel capacity in the tank could be an issue. Most of the time kasi when I gas up for the day tama lang for what I need for the day, like 200 to 400 per loading. Could this be it? But just today nagload na ako ng marami-rami. I have about 600 to 700 pesos of 95octane fuel in the tank.

Today di lumabas yung problema but im not sure if kung na cure yung problem with the so much fuel I loaded up.

So what do you guys think ang problem? Is there something wrong with the pump? Is the mounting or set-up wrong? Should I convert to a submersible type fuel pump? Other mechanics said kasi, pag fuel injection system raw ang engine the fuel pump should be the submersible type inside the gas tank para mas maganda and fuel supply.

Or are there other causes for this? like electrical perhaps, etc. etc... By the way this car is my everyday and family car sa ngayon. house to kids school to work, work to kids school to house. Yung liftback ko naka temporarily standby.

Thanks in advance for everyone's advice.