I have a 96 Ford F150 4.9l auto. I have did alot of tune up parts to get to get it running smooth I just got it . I did a huge work over tuneup plugs wires cap button coil egr idle motor and both 02 sensors fuel filter air filter cleaned MAF sensor.. I had a code with my $250 scanner miss fire cylinder 2 so for 40 bucks I replaced that injector. It will not throw a code for miss fire number 2 anymore unless when I start adjusting my timing when I got the timming about right I cleared codes and it stayed out. Also new vac lines too. I have one question. I still had a kinda rough engine idle. So I know if there isn't a code it's a fuel problam most times . I got my fuel pressure tester and tested it 42psi key on engine off sometimes 43psi and engine running I get 41 psi.I looked in the Hasnyes manuel for the fuel psi specs it says for 4.9 efi models execpt 1987 it is 50-60 psi key on engine off . Then it states all other EFI engines 35- 45psi key on engine off and that doesn't make sense to me so what should it be for my 96 Ford F150 4.9 Efi? Also For the engine running for a 4.9EFI 45-60 psi but then all other EFI engines 30-45.I have a 96 4.9 F150 EFI What should my PSI be? With the readings I'am getting I had a fuel reg ordered in $105 bucks but I would like to know if my psi should 50-60psi key on engine off and engine running fuel pressure 45 to 60 psi. Can anyone tell or know?

Thanks in advance

 

Sorry I got ADHD lol The specs are listed in chapter fuel and exhust so there giving you the specs for the 4.9 and others like V8 302

 

Yes you should see 50-60psi KOEO or engine running and with vacuum removed from the regulator. Engine running at idle you should see about 45psi and pressure should always increase towards 60psi when the throttle is snapped open or the engine is put under load, pressure should never drop below 45psi at any time.

 

that alot I would hate to spend $105 for a regulator and not be it I just needed the specs