Quote Originally Posted by R2D5 View Post
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.

sir, I think that you really need to relocate that External BOSCH Fuel Pump, near the Fuel Tank. hindi talaga pwede ang ganyang set-up na malayo ang Fuel Pump mula sa fuel tank, specially pag Fuel Injected ang makina. coz whats happening is that youre having Fuel Starvation. kinakapos sa gasolina ang makina, specially pag umaandar na kotse.. hindi masyado umaabot ang gasolina to the Fuel Pump since that your Fuel Pump is located too far. and I bet wala pa ito sa tamang level from the fuel tank.

also, hindi magiging accurate ang test ng mekaniko mo kahit na lumabas ng 35 psi ang Fuel Pressure at Idle. specially pag naka mount ng ganyan ang Fuel Pump.. mag iiba agad ang Fuel Pressure pag tumatakbo na ang kotse, specially nga pag nasa 1st,2nd and 3rd gear ka. talagang babalik sa tanke ang gasolina (coz of gravity) at nahihirapan humigop ng Fuel ang External Fuel Pump, lalo na pag sobrang layo sa tanke (at pag hindi pa level) ang location niya.

anywayz, get that Fuel Pump re-located near the Fuel Tank and mount it as low as possible. if not, get a In-tank fuel pump (complete w/ a mounting bracket, strainer, wiring harness & lines) from a Fuel Injected AE92 (or even from a AE101... you might need to do a little custom fabrication work) pero you know how it is sa Pilipinas.. walang imposible. also, if your using a External BOSCH Fuel Pump, make sure that its getting a full 12 volt power source. coz if your not giving it a full 12 volts, that will destroy the Fuel Pump.


aite, peace.