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The easiest way to relieve the fuel pressure is to start your engine and pull the Fuel Pump Relay - car should die. Now there is no fuel pressure. Turn the key to the off position and change out the fuel filter. Once the filter is changed, put the relay back in and prime the system - turn the key on (don't start) for a few seconds. Turn off, turn key on for a few seconds then start the car. Check for leaks by filter. Easy peasy. Hope this was helpful :-)
Sounds like maybe the main computer is bad. When you cranked the engine there is not any indication that it is firing. If you have changed the fuel pump and coil and it still wont even fire, the computer is most likely the cause. Even if the timming was off you would still get some indication that it was trying to start although it probably would not if the timming was off, but the fact it's not even trying to fire yeah that's my take.
If you changed the fuel pump and the fuel filter and ignitor and regulator,in the list of changes do you know you have a EFI. The EFI main relay turn on the fuel pump which includes the circuit opening relay. Testing it mainly passes with flying colors just replace
Do you know for sure that the fuel pump failed or do you have a bad relay? If the fuel pump relay is good no you don't need to replace it. The fuel pump unit comes with the sending unit and a sock filter. I would replace the inline fuel filter when you replace the pump. In line fuel filters need to be replaced every 36000 miles. If that filter starts to plug up it makes the pump work harder which leads to premature failure.
Check for a dirty fuel filter, or it's a fuel pump relay/pump. If it has never had a fuel pump changed on it, it will say AC DELCO on the filter. The fuel filter is located under drivers side door along the frame. Fairly easy to change, and if this doesn't fix the problem, then it is the fuel pump relay/fuel pump. *Hint... it is easier to remove the bed of the truck than to drop the tank out. From experience it is much faster and easier to access.
first check fuel pressure, guages sold at local auto store run $30-$50.. but it is a quick hook up and sorts out alot of maybe'sss.
if in fact there is no pressure you are likely correct in looking at a relay or the pump itself.. relay should be labelled with all the other in hood compartment..
whereas, the fuel pump is likely in the tank, so drop the tank, and replace.. they go for about $100 for a rebuilt.. don't forget to also change the fuel filter.. Subaru put the filter easily located in engine compartment.
It sounds to me like the pump is on it's way out. You could try the the fuel pump relay, there are usually a couple relays that are the same try swapping the fuel pump relay with the horn or something. If the problem goes away then you know it's the relay. Put a mark on the fuel relay before you start so you don't lose track of it while testing. It should tell you in the owners manual which relay is for the fuel pump.
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