Odd issue with my 99 explorer

[outlawz360]

Thanks guys I’ll give that a shot

 

[koda2000]

@koda2000 98 is returnless fuel, should have 65psi (+/-6 psi) at the rail (and one fuel line).

The PVC elbow does not really cause issues on these trucks
The P0171 and 174 codes are 99.5% of the time intake plenum gaskets on your truck

Seriously
This is Explorerforum
We have been building/repairing/fixing these trucks since 1991 around here. I have fixed the 171 and 174 code about 1000000000000000000000 times in the last 15 years, 99.9999999% of the time those codes + 4.0 V6 engine = LEAKY INTAKE O RINGS


AFTER you check fuel rail pressure, AFTER you check the intake tube connections and tubing for any cracks or leaks, THEN inspect the base of the intake plenums and see if there is a build up of soot

I feel like I type this same post every single day..........

ONLY use BOSCH BLUE TOP fuel pump for these 98-01 Explorers ONLY. Dont forget to order a new strainer AND make sure its a real bosch pump not a fake like you can find on Ebay and Amazon. I prefer Rockauto or Summittracing

I believe return-less fuel system began in '99, no? I know our '97 had the return system. If '98 was the first year for the return-less system, then yes 65'ish PSI. If return system then 35'ish PSI.

 

[donalds]

Halfway through 98 they made the switch

 

[outlawz360]

Alright guys she’s finally fixed, I did those gaskets and it was still running very badly. Turns out the first fuel pump was defective so had to drop the tank again and put another in. Now she’s running pretty good, no codes and fuel trims are normal

 

[Mbrooks420]

Way to keep at it.

 

[outlawz360]

Way to keep at it.

Trust me I wanted to blow it up at one point haha