fuel filter stupid question

[cbxer55]

Don't know about anyone else, but mine, the fuel pressure drops to zero PDQ after I shut it off. Was that way with the original fuel pump, and been that way since I put a new one on in 2017.

 

[Curious Hound]

Don't know about anyone else, but mine, the fuel pressure drops to zero PDQ after I shut it off. Was that way with the original fuel pump, and been that way since I put a new one on in 2017.

There should be a check valve in the system to maintain pressure when the engine is off.

 

[cbxer55]

There should be a check valve in the system to maintain pressure when the engine is off.

Is that somewhere near the fuel pressure regulator? When the truck is running, fuel pressure is in spec. And it starts right up, first turn of the key. Don't even need to turn it on and off multiple times to get it going. 207,000 miles.

 

[Curious Hound]

I thought it is often part of the fuel pump assembly in the tank.

 

[lil_Blue_Ford]

I thought it is often part of the fuel pump assembly in the tank.

The “returnless” systems had it on the fuel pump assembly. The older return style systems had the regulator on the rail. Technically the ones in the tank can be replaced but often get ignored until the pump fails.

 

[cbxer55]

Maybe so. But that would mean the new pump I put in it in 2017 was bad right off. Like I said, hasn't caused any issues. Start good, runs good.

 

[Curious Hound]

Maybe so. But that would mean the new pump I put in it in 2017 was bad right off. Like I said, hasn't caused any issues. Start good, runs good.

If it works, drive it.

 

[cbxer55]

If it works, drive it.

I do. It's my daily driver "beater", so my 2004 Lightning can relax in the garage. 207,000 miles on the Ranger, 77,000 on the Lightning.

 

[IRKillroy]

Don't know about anyone else, but mine, the fuel pressure drops to zero PDQ after I shut it off. Was that way with the original fuel pump, and been that way since I put a new one on in 2017.

I had that problem until I replaced the fuel regulator on the fuel rail.

 

[lil_Blue_Ford]

I had that problem until I replaced the fuel regulator on the fuel rail.

The 98+ trucks had no regulator on the rail, its in the tank, but yeah, bad regulator can cause it or failed pump check valve

 

[cbxer55]

Any how, I fixed my starting problems with alcohol. I installed an old Marvel Mystery Oil bottle in front of the Large cone filter. Drilled a hole in the bottom, installed a hose fitting there. Attach a hose to said fitting, run it up over the top of the bottle and attach it to a hose fitting in the intake tube. Put another hose fitting in the top of the bottle, not touching the fluid. Hook it to a vacuum source, in my case the none used EVAP fitting under the TB. Now, when the engine is running, vacuum sucks on the top of the bottle, causing air to enter the bottom of the bottle, sourced from the MAF. The fluid in the bottle bubbles strongly, the tube on the top sucks in the fumes. I use 50/50 isopropyl alcohol and distilled water. You can also just use windshield washer fluid, it is 50/50 methanol and water.

One day, for the heck of it, before I started my truck, I poured some isopropyl alcohol all over the stainless steel mesh cone filter. Jumped in the truck, started it up. Vroom, started right up. No muss, no fuss.

That's what I call a "Bodge fix". For me anyhow, they've never let me down.