When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I JUST REPLACED MY FUEL PUMP AND SENDING UNIT IN MY 1999 EXPEDITION AND MY TRUCK STILL WONT START.
RELAYS AND FUSES ARE ALL GOOD.
FUEL SAFTY SHUT OFF IS NOT SWITCHED.
DOES ANYONE HAVE A CLUE AS WHAT THE PROBLEM IS?
To check spark, you would need to remove a coil and put an extra spark plug in the coil and have it grounded to the engine. Then look while cranking to see if the plug sparks.
As for fuel, you really need a fuel pressure gauge, but you can carefully push in the Shrader valve in the fuel line to see if fuel sprays out. Just be careful because it can be under high pressure, so keep your face away.
Turn the key on for about 5 seconds. then turn it off. Do this 5 times and push the valve in again to see if it builds any pressure that way. It should have about 40psi.