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200KK4 FORD EXPLORER FUEL PUMP REPLACEMENT PROFESSIONAL

If the fuel pump inertia switch is OK, then I still make sure that the fuel pump is getting 12 Volts as the engine is cranking.

For more info on this take a look at the next section: Checking The Fuel Pump Inertia Switch.

That the fuel pump inertia switch isn't activated and cutting power to the fuel pump.

Now, I usually take two more precautions, before condemning the fuel pump as bad and this is to check: This confirms that the cause of your engine's no-start problem is caused by a lack of fuel. OK, now that the testing part is done, let's take a look at what your results mean:ĬASE 1: The fuel pressure gauge registered 0 PSI. Your fuel pressure gauge will register one of the two following results:ġ.) The fuel pressure gauge will register the indicated fuel pressure specificationĢ.) The fuel pressure gauge will NOT register the indicated fuel pressure specification. For more info on the fuel pump inertia switch, take a look at this section: Checking The Fuel Pump Inertia Switch. NOTE: If you haven't already checked the fuel pump inertia switch, do so before you start this test.

Fuel Pressure Specifications (1991-2010 4.0L Ford Explorer, Mercury Mountaineer).

Fuel Pressure Specifications (1991-1997 4.0L Ford Aerostar).

You can find the fuel pressure specifications here:

If you're interested in buying one, take a look at my recommendations here: Where To Buy A Fuel Pressure Gauge. If you don't own one, you can run down to your local AutoZone or O'Reilly Auto Parts store and borrow one from them (for a small cash deposit, which you'll get back when you return the tool). Using a fuel pressure gauge is one of the most accurate ways to ensure that enough fuel reaches the fuel injectors. What makes it easy is that you'll find a Schrader valve on the fuel injector rail that you can connect a fuel pressure gauge to (see: Location Of The Fuel Pressure Schrader Valve Test Port).

200KK4 FORD EXPLORER FUEL PUMP REPLACEMENT PROFESSIONAL

Your local parts house will have a fuel pressure gauge set to sell you, although you'll pay more for it and it won't be a professional grade tool (if that's what you're looking for).Īs mentioned at the beginning of this tutorial, testing the fuel pump with a fuel pressure gauge is very easy. Whichever one you buy, it's an investment that will pay for itself many times over. The price difference depends on what type of fuel pressure gauge set you buy, this means either buying a non-professional technician grade tool or a professional technician grade too. Thankfully, in all of the Ford 4.0L V6 equipped vehicles, Ford was kind enough to put a Schrader valve on the fuel injector rail where you can tap into the fuel system and check its performance.Ī fuel pressure gauge can cost you as little as $40 (US) or as much as $200 (US). All vehicles now use an electrical fuel pump to deliver fuel (under high pressure) to the fuel injectors and the best way to diagnose this fuel pump is with a fuel pressure gauge. Owning a fuel pressure gauge is now becoming a must.

You've sprayed starting fluid (or carburetor spray) into the throttle body and your vehicle started, even if only momentarily.Īlthough the above list is a not a very complete list of symptoms, the theme that runs thru' them, and any other related symptom, is that the engine will crank and crank, but not start.

So you know that the ignition system is not at fault. The ignition coil pack is creating and delivering spark to all six spark plugs.

You can find this tutorial in Spanish here: Cómo Probar La Bomba De Combustible (Ford 4.0L) (at: ).ĪPPLIES TO: This tutorial applies to the following vehicles: Starting fluid and gasoline can ignite very easily. IMPORTANT: Gasoline is extremely flammable! Take all necessary safety precautions, be alert, be careful. More Ford 4.0L Ford Explorer And Aerostar Tutorials.Location Of The Fuel Pressure Schrader Valve Test Port.