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The pic to me looks like an injector pump...though I'm a new 803 owner. I'd guess the rubber line is on the suction side of the injector pump. I'll pull that and see if you have flow and temporarily connect a fuel pressure gauge there.

I bought a running 803 on govplanet last month. Guys here on Steelsoldiers were a big help in getting in operating in tip top shape. I love the idea of getting an engine from a 400hz unit. Good luck.

Update: Got the pressure gauge. Got a small load center and some heaters. I've been running it as hard as it would allow. Was still struggling to get above 75% load and frequency was up and down plus and minus 2 hz. I made up a punch list of things from all of your suggestions. In working...

I ordered a fuel pressure gauge and a tee.

Interesting! I do always find a bunch of carbon on top of the unit after running it.

Uniquify, I'll investigate the pick up tube. I will say, in the process of bleeding the fuel system, I had a lot of flow. I will take note of the smoke color when I get the dummy load set up. The batterys are brand new and fully charged. I don't have a fuel pressure gauge, but I'm not...

Ray70, The unit run OK, but the slight variations in voltage and/or frequency wreak havoc on my computer UPS. Granted, its a cheapo UPS; I've got a rack mounted one that does fine with it. I have seen videos of others machines with rock steady voltage frequency up through and past 100% load...

I hadn't clicked the final save button. Hopefully its fixed now.

I won an auction last week on a 900 hour 803A that ran. The frequency and voltage tend to fluctuate slightly. I have found a tremendous amount of good information so far on the site, but I'm still struggling. My initial though was a fuel issue. So far I've: replaced the fuel pump, replaced...