What is inside of a 930 fuel accumulator

[Jim2]

I'm doing a 930 EFI conversion and I want to know what is inside of the fuel accumulator. Car is a 79. Anyone taken one of these things apart, or have a diagram of the inside?

I'm guessing these accumulators may act as a header tank to avoid momentary starvation in the event the fromt pump picks up some air and delivers it into the fuel line, but I don't understand the fuel line routing. Alternately, I suspect it may contain a pressure regulation device from the appearance of the seam with a possible diaphram, and a return line at the bottom which is similar to the construction of a small bosch fuel press regulator.

Any advice out there?

Jim

[Jim2]

Anyone?

[aseem]

I believe it keeps the fuel system pressurized after engine shutdown, to avoid heated fuel to expand and create gas pockets in the fuel lines.

Edit: sorry, no pics

[javadog]

Jim,

It's basically a can with a diaphragm dividing it in two. The side opposite the fuel lines contains a spring that pushes against the diaphragm. It serves to dampen the pressure of the system while the engine is running and keeps residual pressure on the system for a while after engine shut down.

I've never had one fail on me so I've never cut one open.

JR

[RarlyL8]

That's what it is. One way to verify failure is to pull the bottom line. If fuel spills out the diaphragm has ruptured. The top 2 lines are fuel in and out.

[rotorhead]

Here's a great explanation and a diagram

http://rb-k.bosch.de/resources/literatur/leseproben/u212e.pdf

[bbh03]

What EFI kit are you using? You may not need the accumulator at all.

[Jim2]

Hi guys, I finished my efi conversion back in September.

I turfed the accumulator based on the advice here.

bbh03, I ran a thread on the conversion if you have not seen it:


930 EFI Conversion in process