How to run the fuel pump in a Jeep Cherokee?
Run the fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the fuel return line or most of the fuel will be returned to the fuel tank. The RENIX 4.0L fuel pressure regulator is not adjustable.
What should the fuel pressure be on a Jeep Cherokee?
The fuel pressure specification, from the Jeep repair manual, is 30 to 35 PSI. The only way this specification can be checked is by using a fuel pressure gauge.
How can I tell if my fuel pump is bad in my Jeep?
The ‘quick and dirty’ way to check to see if a lack of fuel is causing your 4.0L Jeep to no start is using starting fluid (although it’s not the most accurate way of diagnosing a bad fuel pump).
What kind of fuel injection does a Jeep Cherokee use?
To properly diagnose your system you must check fuel pressure using a fuel pressure guage. Test procedures are intended for RENIX 4.0L engines only. 2.5L engines have THROTTLE BODY INJECTION and HO engines have a different fuel system!
What happens if the fuel pump fails in a Jeep Cherokee?
The fuel pump, in your 4.0L equipped Jeep, usually fails in one of two ways. It’ll either stop pumping fuel or it will pump a volume that’s lower than normal. Obviously, when the fuel pump completely fails… your 4.0L Jeep isn’t gonna’ start. In this type of scenario, you’ll see that: The engine turns over but will not start.
The fuel pressure specification, from the Jeep repair manual, is 30 to 35 PSI. The only way this specification can be checked is by using a fuel pressure gauge.
How to troubleshoot a bad fuel injector in a Jeep Wrangler?
TIP 1: The engine in your 4.0L Jeep Cherokee (Grand Cherokee, Wrangler) needs to be at operating temperature to get an accurate snapshot of the condition of the fuel injectors. TIP 2: If your Jeep doesn’t start, you don’t have to worry about performing the test with a warmed up engine.
What happens when the fuel pump is low?
The PCM will still pulse (activate) all 6 fuel injectors. But when the fuel pump sends a lower than normal volume of fuel, your Jeep will start and run but with engine performance problems. You’ll probably see one or more of the following symptoms: Rough idle. Engine starts after extended cranking.