you might have blocakage upstream too. if the showerheads are gone, FSV might have stuff blocking it internally.
I was starting to think that also.
I still think you have a problem. On flat ground, fuel should siphon out out of the line from the tank, no pump required. So if your pump is drawing enough of a vacuum(against the tank) to crush even weak fuel line... you have a blockage somewhere.
Idk about that one, the lift pump is going to pull a vacuume regardless of blockage or not. A soft line especially warmed up has no chance of staying open. Ever seen a lower radiator hose with no spring? It’ll suck shut at high rpm, doesn’t mean it’s backed up
What purpose does the loop serve?
The motor moves around on it's mounts as well as vibrates; the loop allows for some movement and less stress on the hose.
Well when you pull that line off the lift pump it should be like a faucet of fuel since that is the lowest point in the fuel system. I would at least try to blow some air back to the tank
Mine was blocked after my rebuild and so was fuel cap. Would run a bit loose power fall on its face and then die. Took the fuel cap off and ran great so I knew then I had some blocked vent and/or cap so just replaced cap and removed vent and ran a pipe cleaner through it. Replaced the hose on vent cause it looked pretty rough anyway. Made filling up faster too without the spray back leaving me greasy to go to a wedding in. Lol
Where is that located?
I last time I replaced the mech lift pump I noticed the hose, even new hose, tended to collapse in the loop. I found a spring with an OD slightly less than the 3/8” hose ID- think was a “spring door” spring. Stretched the spring coils out a little so it will configure around a small loop better than as originally wound. Then thru trial & error figured correct length to shorten spring to and pulled it thru hose so about an inch shorter than hose run to allow room to slip over pipes where clamped. Found a 5/16” UNC thread fit nicely into end of spring which allowed “grabbing” end of spring with a short “pulling mandrel” to attach a wire to pull thru hose- just thread spring onto it a thread or so as longer attachment makes unthreading inside hose more difficult. This inner spring won’t allow hose to collapse, won’t rust due to diesel and doesn’t significantly reduce flow. Had considered an external coil similar to those on hydraulic lines of heavy equipment but couldn’t find small coil and stumbled on this idea- works well for me ;-) Just an idea to consider.
