[DaddyGlenn]

I've had warm start challenges for a while now but a couple weeks ago, it stranded me.

Scenario: 1 hour drive down the highway on a hot summer day. After sitting for about an hour, it would not start. The engine turned over but would not fire. I noticed I did not hear the fuel pump turn on with the key in "run", as I usually do. And I could not tell if it turned on in "start". I opened the air box and lifted the air meter to see if the pump ran but could not hear anything. I tried starting it several more times, with no luck. I towed it home and put it on the lift, figuring I had lost the fuel pump or relay (I did not have a jumper or spare relay with me).

Testing: I applied power directly to the FP and it ran. Lifting the air meter also caused it to run. So, I tried starting it. It started.

Today, I measured the fuel pressures.

Temp at the Warm Up Regulator was 21.8C/71F
System Pressure - 4.8 bar/70 psi
Cold Control Pressure - 1.35 bar/20 psi
Warm Control Pressure - 2.9 bar/42 psi (after 5 minutes)
Residual Pressure - Dropped to 0 after 13 seconds

No fuel leaking anywhere. So I am losing pressure at either the check valve (built in to the fuel pump) or the Accumulator.

My accumulator is the type with 3 hoses. If I remember correctly, the hose at the bottom should only see fuel if there is an internal failure of the accumulator. When I pulled the bottom hose off the accumulator, a good bit of fuel came out.

Diagnosis: Failed Accumulator. The only thing it doesn't explain is why lifting the fuel meter when I was stranded did not trigger the pump. (Or maybe it did, but I couldn't hear over the ambient noise and did not run it long enough to get the fuel pressure up.)

Any other opinions or thoughts?