Iwanna928

I started smelling gas when driving my car. Got the car home and started looking at the fuel lines. I went to the back of the car, passenger side and there was a drip. It was in front of the passenger rear wheel. I took the tire off and pulled the cover off where the fuel filter is and a fuel pump or fuel pressure regulator. Not sure what it is called. Started the car and there was a fine mist coming from the top and a drip at the bottom.

I am not sure what this part is so I can order it asap. 928 Motorsports has a adjustable fuel pressure regulator for $340. It could be a upgrade if it replaces what is leaking. Would this replace my problem or am I looking at the wrong part?

Stephen

algie928s4

I think fix is cheaper, looking at the PET for a 1979 my money would be on either 29 (fuel accumulator) or 39 (fuel filter). both have 4 different part numbers on the PET so not much good, there seems to be quite a few variences as to what is under the part of the wheel arch, I'd either take a photo and post here or take it off and look for a part number. Picture is best I could do, left hand side kept disappearing for some reason!

SeanR

There should be a filter and the accumulator back there, I've replaced a couple of those that rust out and start leaking.

tailpipe

if your really lucky its just the filter but its sounding more like the accumulator take your time and hit the lines with penatrating oil good they can be nasty to get out, take everything out as a unit if you can then dissassemble as neccessary

Iwanna928

It is number 29 the fuel accumulator. No question. the mist was coming from the top and drips from the bottom. The filter had a date of 94 on it so I figured it should go.

On the positive note, my rims are OEM not replics. Checked for that when I took the wheel off.


Stephen

James Bailey

The early fuel pressure accumulator was a two hose in and out with a small vent hole near a screw. When the internal diaphram fails (they all do) it then blows out fuel . Later pressure accumulators have three connections with the vent plumbed back into the fuel recovery tank system. The fuel presure accumulator is there to maintain pressure for hot restarts and does NOTHING for the running of the engine. Cheap quick "fix" can be using a few feet of injection rubber hose to eliminate the accumulator. Works just like a garden hose....when you turn off the spigot at the house the hose can retain pressure if you have a spray nozzle on the end !! The expansion of the rubber hose accumulates pressure !

Iwanna928

James That is awesome! Looks like a few feet of hose will be coming up!

You made my night, now I can go to bed and sleep like a baby and tell my wife in the morning that I don't have to shell out a bunch of cash!

Stephen

dr bob

You are going to want that accumulator. Jim's 'fix' is a way to get you to the weekend, but probably not a serious long-term solution.

The accumulator helps maintain pressure in the system after the pump is shut off. When you shut off the engine, the heat from the engine will try to boil the fuel. With pressure maintained, the boiling temperature is higher. With no pressure, the fuel flashes to vapor in the lines and the fuel metering unit (the "fuel distributor") and the warmup regulator. This makes hot restarts very tough, with the system essentially 'vapor locked'.

Trust me, Porsche/Bosch would not have put that part there if they could have avoided it. But particularly for folks who live and drive in warm climates, and Florida qualifies I think, the accumulator makes restarts possible.

Iwanna928

What size injector hose do I need. This will be a quick fix until I replace the accumulator!

Stephen