Kevin in Atlanta

I ask because I just completed a top end refresh complete with new fuel lines and my car won't start. I had all of them apart and there did not seem to be markings to indicate flow, like the MAF sensor does.

I have spark, I hear injectors and I have fuel coming from the fuel pump as witnessed by a fuel leak at the PS fuel dampner. I was going to pull a plug to see if it was wet, but was curious about how dampners and fuel regulators flow.

Thanks in advance.

Rob Edwards

I swapped the FPR and the front damper on my stroker when we were assembling, handed them to Greg who Assumed I knew what I was doing..... So yes, they are diredtional, and won't flow backwards.

the flyin' scotsman

the front dampner fuel input is from below, the outputs to each side.

the fuel regulator inputs are from each side and the output is in the middle to the cooler.

exact opposite flow.

Kevin in Atlanta

How do you know which way to mount them? Is there an arrow I missed?

Rob Edwards

No arrows. The part numbers are your indicator. For S4+, front 3-way damper is 0 280 161 034, left rear 2-way damper is 0 280 161 035, and the right rear 3-way FPR is 0 280 161 297.

GregBBRD

This was a "we" thing. I generally replace part number for part number, so I don't have to think very much. "We" both learned something this day. If the "regulator" gets installed into the front "damper" position....not a drop of fuel will go past it......and an "044" pump gets really noisy when dead headed.

Bertrand Daoust

I did the exact same thing when I did my intake R/R.

https://rennlist.com/forums/928-foru...r-r-fixed.html

Kevin in Atlanta

PS rear 0280 160 262;DS rear 0 280 161 035; Front DS 0 280 161 034 - So I think they are in the correct position. I pulled a plug and it was bone dry. I compared mine to Dwayne's and they seem to be facing the same way. Used screwdriver to listen as my son cranked the car and the injectors are clicking. I know I have spark. Bertrand, I read your posts - thanks - nice to know I was not the first to ask the original question. Oh the fuel pump is silent - but I am getting fuel for sure.

I'll fully charge the battery overnight and see what I get tomorrow.

Hilton

Unless you've replaced the fuel lines to the fuel cooler with the 88+ setup, you have a different FPR with a barb, which can't be mistaken for the front dampener.

So your lack of fuel cause is elsewhere.

Have you tried jumpering the fuel pump relay position to see if the pump runs? If it runs, do you have fuel pressure in the rail?

Jump it, walk around the back to listen, then go remove the jumper, and before doing anything else, check the vacuum lines on each dampener and the regulator for fuel leaks. Also check all the unions on the new fuel lines too, while you're at it (always jump the pump to check for leaks before loading up the engine bay with sparks).

Kevin in Atlanta

With a full charge and a little patience she fired right up. Rock steady idle.

Fixed a tiny fuel leak. Lesson: tighten the connections before tightening the mounting nut on the PS fuel dampner.