Engine Coughs Going up Hills

[120L]

Greetings

My 1983 2.8 litre Patrol runs beautifully except when going up hills. Super smooth and nice at idle and runs perfectly down hill and along the flats but when faced with a hill it starts to cut out.

Could it be a fuel pump issue?

I've changed the air filter and used carbie cleaner down the throat of the carburettor.

The only other thing is an exhaust blockage which rears its head when the volume of exhaust increases?

Any suggestions appreciated.

Regards

Alan

[GQtdauto]

Sounds more like a fuel pick up issue , something is blocking somewhere and restricting fuel when inclined , could be pump or pick up something loose .

[dom14]

Going up hill fuel starvation issues usually can be read as gravity related issues.
That is usually from the carby float.
If you haven't done the carby in recent history of the vehicle, it might be a good idea to pull it out and put a rebuild kit through it.
Assuming there is plenty of fuel in the tank and there is no issue with the pickup inside the tank. it's not likely the fuel pump.
Fuel pump issues don't usually show up when going up hill. It should be all or most of the time.

Not sure what kinda exhaust blockage you have, but if you have a one, then it will most certainly affect on high revving(not necessarily going up hill).

If the issue only shows up going up hill(not high revving on lower gears), there is a high probability it is a carby float issue.

[120L]

Thanks for your replies. I'll do a bit more investigating.

But you might be able to help me with what I have found so far.

My patrol has two fuel pumps in parallel???

Can a new set up like this be bought, because the one Fuelmiser has listed is a single pump?

Regards

Alan

[GQtdauto]

Thanks for your replies. I'll do a bit more investigating.

But you might be able to help me with what I have found so far.

My patrol has two fuel pumps in parallel???

Can a new set up like this be bought, because the one Fuelmiser has listed is a single pump?

Regards

Alan

This is one for the experts , never seen two in parallel before .

[dom14]

Thanks for your replies. I'll do a bit more investigating.

But you might be able to help me with what I have found so far.

My patrol has two fuel pumps in parallel???

Can a new set up like this be bought, because the one Fuelmiser has listed is a single pump?

Regards

Alan

I can't see why it needs two in parallel unless it's an intentional thing.
The pump required for a carby engine of that size should be around 3-6psi.

Before you replace fuel pumps find out whether they need replacing.
Remove the fuel hose near the carby and turn on the ignition and see if
the fuel is coming out properly(attach a coke bottle or something transparent and observe the petrol flow)

You mentioned an exhaust blockage in the OP. You need to fix that first.
Get hold of a vacuum tester and check intake vacuum as you rev the motor, or
simply fix the exhaust blockage where ever it is.