40 Bog Down - help pls (1 Viewer)

[REDDER1]

Hey all
So I a little perplexed.
‘78 FJ40

I replaced the fuel tank, all lines, fuel filter.
Put a new inline electric pump to help with the orig factory fuel pump

Prior to me replacing the tank, lines etc she was running fine

Now after all the new equipment…she bogs down going about 40 slight incline and uphills only… to the point of stalling

Feels like secondary carb fuel starvation but I don’t get it. I replaced the old fuel delivery stuff witn the EXACT same setup …just new stuff

I did not replace the factory mech fuel pump. I may replace that…but I have no idea why it’s starving for fuel uphills

Any ideas ??

FYI - The fuel filter looks good and all vacuum hoses connected and distributer cap looks ok

 

[ceylonfj40nut]

Did mechanical fuel pump work on inclines?

 

[REDDER1]

Did mechanical fuel pump work on inclines?

Yes old set up worked fine
Old set up was mechanical + inline elect

New set up is same

I’m wondering if my mech fuel pump
May be bad??

It just doesn’t make sense because nothing changed ffom old to new set up except new equipment

 

[sogncab]

Something in the pickup?

 

[atazman]

Something in the pickup?

New electric pump does not have enough gpm capability?? Try the old electric pump.

 

[REDDER1]

New electric pump does not have enough gpm capability?? Try the old electric pump.

The elect pump is the same make, flow and model as old one.

It is seriously its a wtf head scratcher…

 

[jmylie]

If the mechanical fuel pump works, why install an electrical fuel pump?

Maybe the 2 fuel pumps are the problem.

 

[OSS]

When fuel system parts get replaced, gunk in the old parts can get dislodged and end up in the carburetor. Just replacing a fuel filter can do it.

The same symptoms as OP happened to me years ago, (carbed FJ60) driving up an incline would make the engine sputter.

I removed the carburetor and inspected the float bowl - and low and behold there was a tiny piece of junk floating around in the bowl which apparently would get sucked up against the primary jet when the carburetor was tilted back - when going up a hill.

I cleaned out the bowl and put the carburetor back together- and the engine ran normally afterwards.

 

[REDDER1]

When fuel system parts get replaced, gunk in the old parts can get dislodged and end up in the carburetor. Just replacing a fuel filter can do it.

The same symptoms as OP happened to me years ago, (carbed FJ60) driving up an incline would make the engine sputter.

I removed the carburetor and inspected the float bowl - and low and behold there was a tiny piece of junk floating around in the bowl which apparently would get sucked up against the primary jet when the carburetor was tilted back - when going up a hill.

I cleaned out the bowl and put the carburetor back together- and the engine ran normally afterwards.

Thanks
I’ll take a look at this

 

[bkfj40]

I would ditch the elec fuel pump. You don’t need it. The factory mechanical pump has driven cruisers around the world.

And check the bowl

I had an old 55 years ago that would bog down after changing the fuel filter. Turns out that there was a lot of rust in that fuel tank and it clogged the filter.