Question about 1999 Ford Explorer
Hello, well at least you know the end cause is there is no fuel at the check valve. Can't really explain cold start part, except the Brain needs a signal from the Water temperature sensor to put it in a "Cold cycle" start with higher idle and richer fuel mix. This sensor is not the one that runs the dash indicator. It also would not kill all the fuel pressure. Most likely a separate problem which can be fixed with a new sensor.
When you mentioned fuel solenoid, were you referring to the Relay in the Black box full of Relays?
A relay would explain the hit or miss fuel pump action. Check the Relay plug sockets for Corrosion. A bad Ignition switch could also fail to power the Relay. Having to turn the Ignition switch 4 to 6 times to get the fuel pump to work can mean the Run terminal inside the Ignition switch is worn. The Start terminal in the Ignition switch would power the fuel pump only while the Starter is cranking.
As for parking downhill, a bad fuel pressure Modulator would allow all the fuel to siphon back to the tank overnight, leaving you with a dry start in the morning. With a working fuel pump this pressure is restored in seconds, but with your problems it can explain why you benefit from downhill Parking.
You are correct about strange actions. Seems you have 4 or 5 things that could be wrong with nothing being definite. The Ignition switch is cheap to try, no expense to look for corrosion in the Relay plugin. A Relay for the fuel pump if it is not the Solenoid you were indicating. If no pressure again at pressure check valve, disconnect tank side of pressure Modulator and see if it has pressure (Indicating a faulty modulator). The Temp sensor for the Cold start cycle.
Would like an update for what you found.
Posted on Nov 08, 2010
Testimonial: "MADE SOME VERY GOOD COMMENTS AND GOOD PLACES TO START LOOKING THAT WON'T BREAK YOUR POCKET AT THE GET GO"
Remember, if money is tight and times are hard, find your nearest Wrecking Yard! Auto-dismantlers like Pick n Pull can be a great money saving option. If you go to a yard where you have to remove the parts, these are great places to learn and break things. That way you don't have to learn costly lessons the expensive way!
If the yard you visit pulls the parts for you, chances are they will also guarantee the part for like 30 - 90 days. If it's the wrong part or it doesn't work, they'll exchange it for you and get you the one that fits and works! This is still a lot cheaper than buying it off the shelf or special ordering and having to wait for it to be shipped.
Last thing: Since you're decided to replace the fuel pump, do yourself a favor and go buy a new fuel filter!!! This is CRITICAL when changing a fuel pump! The reason I say this is because the fuel filter is the most overlooked and under-changed filter on every car ever made! And with electric fuel pumps (most of which are of the In-Tank style), you can never be sure what caused it to fail. If it's dirt that killed it, then the dirt is in your tank and fuel system right now! That means the fuel filter has also failed. It may have holes in the filter element letting dirt flow into and through the pump, destroying it from the inside or the fuel filter may be clogged after so many years of being ignored. This causes Back-Pressure to build and make the fuel pump work harder than it was designed to work, thus causing it to wear out and fail. So change the filter. Regardless of where you get the pump, if it fails and you take it back to exchange it, one question will be asked: "Did you replace the fuel filter when you installed this pump?" Answer "No" and you'll be buying another pump! Trust me, I've had to enforce that policy and people are not happy when they hear that even though I show them where in the box that notice is and have them read it before I pull another pump off the shelf along with a new fuel filter.
Oh and NEVER try "Testing" a new pump out of the tank! The pump is designed to use the fuel as it's coolant and it's only Lubrication!!! A 2-second test can fry an electric pumps seals.
Anyway, keep us updated and Good Wrenching!
Posted on Jan 10, 2011
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Posted on Jan 02, 2017
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