Intermittent issue of RB30 Patrol Fuel Pump Control Unit

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Originally Posted by mudnut

Mate, grab a secondhand one from a wreckers and try it. I got one for 5$ as a spare.

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Mate, You're lucky. :D
They are asking lot lot more than that for it.
But, it's not the price, to be honest.
They fail, 'cos of the aging, not necessarily 'cos it's flooded with water.
The $5 one you have as a backup may not be as good as you want it to be.
I do get your point though.
I'm fiddling with electrics/electronics 'cos like you yourself, I enjoy making things hard
for myself, with the idea it will make things easy for myself in the long term.(I hope I got that right)

Don't forget, your RB30 troll is a thinking bastard with a consciousness of it's own. ;) :D
Mine's been really good to me so far....whenever the troll breaks down, it broke down at places
I didn't have to abandon the bastard & cry. ;). In reality, it may be 'cos I've been taking care of the troll or may be not.
You never know.

I still have to confirm the wiring between FPCU & the battery/alternator line has no bad connections.
It's easily said than done. Chasing intermittent issues in wire harnesses is like chasing a gremlin. :)

The fuel pump is just a DC motor. All it needs is positive and negative to work. Where it gets complicated is the safety switching. You can make this as complicated or basic as you like.

I wouldn't be to concerned about the age of the electronics. I don't necessarily agree that it means it's more then likely to fail, after all it's what 25 years old now and still going. The main thing is if it does fail you know how to bypass it to get going again.

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Originally Posted by dom14

Don't forget, your RB30 troll is a thinking bastard with a consciousness of it's own.

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Mine's just a bitch. :)

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Originally Posted by dom14

I still have to confirm the wiring between FPCU & the battery/alternator line has no bad connections.
It's easily said than done. Chasing intermittent issues in wire harnesses is like chasing a gremlin.

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This is concerning. You keep posting regarding problems with your auto choke, fuel pump and charge circuit. These all have a common feed the alternator warning light circuit….

You could try setting up some temporary warning lights on the inputs to the FPCU. This way you will have a visual when it starts playing up.

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Originally Posted by Yendor

The fuel pump is just a DC motor. All it needs is positive and negative to work. Where it gets complicated is the safety switching. You can make this as complicated or basic as you like.

I wouldn't be to concerned about the age of the electronics. I don't necessarily agree that it means it's more then likely to fail, after all it's what 25 years old now and still going. The main thing is if it does fail you know how to bypass it to get going again.



Mine's just a bitch. :)




This is concerning. You keep posting regarding problems with your auto choke, fuel pump and charge circuit. These all have a common feed the alternator warning light circuit….

You could try setting up some temporary warning lights on the inputs to the FPCU. This way you will have a visual when it starts playing up.

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Of course. Thanx mate. I will setup warning light for each feed of the FPCU.
Auto choke is working fine now, I was able to locate the internally broken wire near the auto choke heater unit.
http://www.nissanpatrol.com.au/forum...-Weird-problem
Charge circuit is ok. No dramas atm.

It's only recently I understood the way alternator warning light system work and how that line runs around the electrical harnesses to
create earth connections that turn positive(almost +12V) lines when the engine runs.

BTW, it's not that impossible to repair the FPCU. All the components its' made up of are available to buy including the little relay in it.

I forgot to mention, I ordered a used FPCU from fleabay which cost me a "fortune" and it arrived as a stuffed up one.
That's why I thought they are not that reliable.

Bad new for me mate.
The petrol pump failed today even with the direct connection to the wire coming out
of the FPCU to the petrol pump/tank.
I reckon either the wire/connections in between the pump and the FPCU is bad
or the pump itself is going bad.
Another PITA job for me.(Not a big fan of under the chassis work :()