I have a 94 F 150 4 by 4 5. 8 liter front fuel tank does not work only starts on rear tank it is a long crank to start and the idle is very low at times fluctuates up and down.any suggestions please

SOURCE: 3.1 engine 96 misfires trough driving speeds and idle

i had a 94 that ran into problems like that with very rough idles and misses. i get about five different codes from injectors to oxygen sensor. turned out my negative wire from the battery was so corroded inside the insulation it was causing all sorts of problems. bought new cable and ends from canadian tire $40.00 and installed (had to clean the connection to the block with sand paper) but fixed all my problems after that.

cheers

SOURCE: 2001 Buick Century fuel gauge

fuel sending unit is faulty needs replaced unfortunatly you will be forced to buy the entire fuel pump (module). they are not cheap.

SOURCE: 1999 7.3 liter turbo diesel. Won't start. Turns

u need to check al or your fuses! first ! this truck has an electric fuel pump mke sure itcomes on! no white smoke! suspect faulty idm aka injector drive modual

SOURCE: '96 f150,4.9 six,dual fuel tanks,replaced front

I have a 1996 f150 and I had the same problem. I finally found out that the rear fuel pump is the main pump, and if it goes out then the front pump will not work either. There is a groud that both pump share on the rear cross member. If you are not getting good connection with the ground the fuel pumps will not work. Also if you replace the rear pump and it still does not work then your problem could be the fuel tank selector switch, it acts as a relay if it goes out then neither pump will work.

SOURCE: 2002 WG Jeep Grand Cherokee

The error P1130 and P1131 is for the fuel trim and lean fuel mixture respectively. This tells me that this may be an issue with the air fuel mixture or its reached its limits in compensating for the incorrect mixture. You could try to clean out the intake first using carb cleaner spray or tuner spray to clean out the intake and the MAF sensor which measures the air that comes in. Check also if there are leaks or gaps on the air duct found between the air filter and the intake manifold and the intake plenum. Leaks would cause the system to get an incorrect reading. If it were a faulty sensor you should get the error code for the sensor and you may have issues starting the engine up.

Check also the vacuum hoses which may be loose or cracked that needs replacing or refitting. This is also a common cause. I also do not rule out the possibility of the fuel sensors going or starting to go bad. The PCV may also need cleaning or replacing.

With all mentioned items go check first the leaks of the intake system and the vacuum lines as these are found to be common. Some leaks or cracks are minimal but is crucial to the sensors.