There have been a few threads about LPG/Petrol TB42E's running badly, but not a lot of clear answers. Here's some photos and info that I hope will be helpfull to others.
Runs fine on gas, but switch to petrol and it will idle OK but coughs and farts when you push the go pedal.
It was suggested that the fuel strainer was clogged, so I dropped the belly tank and pulled the pump out. - sure enough the pump strainer was pretty dirty.
THis is the tank strainer after cleaning it (on a different pump for testing)
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Dirt and dust had entered the tank from a split breather hose. The 3/4" breather that runs to the filler cap had turned hard and split right near the tank. Some clown had used heater hose instead of fuel vapor hose.
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Because the tank was a bit of a b!tch to remove, I figured it would be smart to test the pump before refitting the whole shebang.
I made up a test jig from some spare hydraulic parts, variable pressure relief valve and an air compressor gauge.
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The fuel pump was only pushing about 1.5 litres a minute at 17psi . Above 20psi the flow stopped.
Specs are hard to get, but it should push about 4 litres/min at 40psi.
Ordered in a Fuelmiser pump FPE284 which cross referenced to the EP128AU Ac-delco pump. Base is different, terminals are different, won't mount on original Patrol tank sender. Modified the sender with some 8mm rod, fuel rubber and hose clamp to take the FPE284 pump, drilled out the terminals to fit.
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Tested the new pump on my test rig - 4.5 litres/min @ 40psi, 3 litres/min at 60psi, pumped up to 80psi before the pump pressure relief valve let go.
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FItted it up and it runs without a problem.
But the "O" ring on the top of the tank that seals the pump/sender is leaking. Pull the tank out again "oh joy" NOT.
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