Thread: Fuel problem in 4bd1

Anywhere you could be sucking air in? Did you fit all new lines when you built it? May as well check the 2nd pump to be sure.

Had similar problems on my County.

Have you checked the fine filter on the end of the fuel pickup in the tank ? My pickup/sender is on the side of the tank. Unscrew quarter of a turn and check to see if you have a blocked filter there.

thanks for the replies.

the fuel lines were mostly new, reused the old fittings.

the pickup on my tank doesn't have a filter from memory. Although its been a couple of years since I fitted it.

I think air is getting in some where. As I said I fitted an inline filter before the lift pump. A tell tale sign that I didn't initially see is air occasionally bubbling up through the filter.

I intend to push compressed air back up the fuel line to find the leak.

Let us know how it goes. I prefer using hard plastic or metal lines for diesel, it seems to make leaks less likely.

Btw - do you live at camp hill or thereabouts?

When you say you have replaced the pump, do you mean the hand opperated primer pump or the complete mechanical pump fitted to the side of the injecctor pump.
From memory there are 2 one way valves inside the pump, one just below the hand primer, if the one way valve has gunk in it then the whole suck & blow mechanism will not work.

PS. its good to hear that she is finally mobile again.

Rob

you could blow back the lines but if you have the hosing available,

remove the fuel lines from the top of the tank, fit loong hoses and imerse them in a jerry of dieso.

reprime the system if you can, gravity feed it if you have to..

once you have the system primed, put the jerry on the roof and let gravity do the work.

crack the bleed nipple on the fuel filter untill no air is coming out.

blow dry the system with compressed air then dust with talcum powered (put some on the drive way as well.

dip the engine oil.

go have lunch

come back and eyeball for leakes, if theres a rise in oil level then the pump is leaking back into the engine.The plunger pump on the isuzus has a notorious habit of leaking air from the manual priming plunger. to double check this unscrew it and get it ready to use (leave it up) while your having lunch.

when you buy a new pump, before fitting it, you should lube and hand prime it off of the vehicle, sewing manchine oil squirted up the inlet and vasaline on the plungers before fitting and a drizzle of dieso into the outlet before plumbing itup... just occasionally you will get one thats been sitting and the seals have deteriorated, most places will do a one for one for you but theyre not that hard to rebuild if your handy with spanners

Interested to hear what the outcome is here as i have/had a similar problem on mine. Tank got to 1/4 when suddenly engine stopped. Primed as it seemed to have air in the system. Away it went running great, then about 70ks down the road stopped again. 3 times on the way home. Pulled the filters out, checked the lines for leaks. Nothing. Now driving around town with a full tank haven't had any problems. So don't know it I've fixed it or not.
Is it possible that it is the manual priming pump leaking air in but not fuel out? This could cause RAR110 problem too.

Only time I have ever had a problem was on a recent trip through central and north america in a mates 4BD1 110. We were in the middle of nowhere in Wyoming, turning off the highway to get diesel because the guage was on about 1/8th, and the engine cut out. Fortunately we were only about 100m from the servo (gas station). Once we had filled up I primed it up (filter on manifold only - primed really quickly) and it was fine for the next 7000km - but we made sure to fill on 1/4 or thereabouts every time.

Btw - the diesel pump only gave us 50L then died, so we couldn't see if the problem was just that the tank was empty and the guage inaccurate.