Fuel pressure should be a minimum of 40 PSI. closer to 50 is better at idle. You may have a bad check valve in the fuel pump letting the fuel pressure bleed off, causing the long crank times.

How much fuel pressure should a 2000 Jeep Cherokee have?

Fuel pressure should be a minimum of 40 PSI. closer to 50 is better at idle. You may have a bad check valve in the fuel pump letting the fuel pressure bleed off, causing the long crank times.

How do you check the fuel pump on a Jeep Cherokee?

take the fuel line off the fuel rail and bump the starter… if fuel comes out then its not the pump… but if it runs on starting fluid id bet money its the fuel pump… otherwise it would be the fuel pump relay or a fuse keeping power from the pump… the pump can be pulled easily with the tank still in… you can …

How do you check fuel pump on Jeep Cherokee?

Take off the air cleaner and hold the throttle plate open with your hand. Spray some carburetor cleaner into the throttle body. Try to start the car for 2 seconds. If it starts, the fuel pump is the problem.

How can I tell if my fuel pressure regulator is bad?

Symptoms Of A Bad Fuel Regulator

  1. Engine misfires/poor acceleration.
  2. Black smoke coming from the exhaust.
  3. Spark plugs appear black.
  4. Reduced fuel mileage.
  5. Gasoline in the vacuum hose.
  6. Engine backfires.
  7. Engine won’t crank.
  8. Excessive fuel pump noise.

How much fuel pressure does a Jeep Cherokee have?

For 87-90, your pressure should be 31 psi at idle. Then disconnect the vacuum line leading to the fuel pressure regulator and it should jump to approximately 39 psi. If you have only 7 psi, you have a SERIOUS flow problem!

Can you test fuel pressure with a tire gauge?

Yes, a tire pressure gauge can conveniently work as a fuel pressure gauge too. However, to be on the side of caution and safety, you are advised to immediately discard any air pressure gauge used in measuring fuel pressure afterwards, since fuel is known to be volatile, which makes the whole venture a risky one.

What is the fuel pressure specification for a Jeep Grand 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 do you test fuel pressure on a Jeep Wrangler?

Connect the fuel pressure gauge to the Schrader valve on your 4.0L Jeep’s fuel injector rail. When ready, ask your helper to cycle the key on and off but don’t crank the engine while you observe the fuel pressure tester’s gauge.

What are the symptoms of low fuel pressure in a jeep?

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. Lack of power when accelerating the vehicle down the road.

How do you check the fuel pump?

The only way this specification can be checked is by using a fuel pressure gauge. Checking the fuel pump with a fuel pressure gauge is the most accurate and professional way of checking the state of the fuel pump (by the way, it’s how it’s done at any professional repair shop).