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The bleeder valve is not necessary as long as your tank pump is working. On my trucks with the bleeder valve opening I install a 0-100psi fuel pressure gauge. Note, you will only see pressure here if the engine is running. The tank pump barely creates 5psi with the engine off.

The problem I have with this kit is there is no bypass relief valve. I recommend not installing it unless you're sure your IP has a way to vent the pressure, and there are several different IP models found on LD-4xx multifuel engines.

Do you have a PTO on the transfercase and is it connected to anything? That's what the lever should control. There is nothing wrong with having one secondary fuel filter, its a common modification, although I am not familiar with that filter mount. Explanation...Ok...Fuel comes in one side...

The M35's REO OA-331 engine made peak horsepower at 3200rpm -- 600rpm more than the A1's lds-427. Many of those early multifuel head gaskets could've been blown due to operator error. Sent from my SM-G930V using Tapatalk

That's cool, the LDS-427 is definitely an A1. If I saw one at that price I'd grab it too! Most parts, filters, injection pump threads, etc you read about here will apply to your A1. The main difference between the A1 and A2 engines was displacement. By adding displacement to create the...

An actual A1 is somewhat rare, most were upgraded to A2s. What does the engine data plate say? You'll find it on the passenger side of the block. As for advice, absolutely clean the tank and replace all the filters. You'll also want to replace the fuel pump hose inside the tank, and there is...