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TR674

Fuel Injector problems

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Hello kind folk, I'm having a problem with 5 & 6 injectors having air in the line when left over night. It takes them a while to get pressure up and a nice spray cone. No external leaks I can see on the metering unit. I've bled them a few time now and still same result when left overnight. There is a lot of previous info on this forum, but I don't know where to start. The fuel injection system falls into the Dark Arts for me.........

Regards

Craig

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Thanks Mike.

this is most likely a dumb question, but how do I check them for correct working order?

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if yer on a so called newer filter type, the yans that so called specialists sell,

then its this thats  the cause of alot oft problemo,s

ev a good think aboot it,  a clue for ye, think deisels

 

other things can be leak,n  O ring int ends, allowing fuel t,sneek oot

faulty non return valves int MU

injector pipes get,n to hot, boil,n fuel int pipes an causing vapour lock.

esp whenst engine is shut doon, as fuel is then sit,n int pipes, no moving as when pump /engines going

move pipes away frae the rocker box if they clamped onit.

leave bonnet open , let hot air oot

the list is quite long if ye want it sorted for good,!!

 

most moderns ev a fuel cooler, t stop fuel get,n too hot t,boil

an this wid electroniic injectors,

 

yer cars got basicly a olde diesel pump method of working, { pressure t,open injectors }  air int system  will kill the engine,

ye gotta get rid oft problemo, and yer no alone, as most unfettled TRs suffer same fate

 

M

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Have you tried swapping those injectors with say 1&2 to see if the problem is with the injectors or the MU?

Do they rattle when you take them out and shake them? Could be the o ring has gone hard and is dripping/draining the fuel out over night. 

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Chopper, yes the 'nipples' at the end of the injectors rattle. All others still have fuel pressure behind them.

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So 5 & 6  rattle , the rest are held closed by fuel pressure? 

You wouldn't have used any stale Australian high octane recently, it really attacks elastomers like O rings and non return valves .

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Mike, I use high octane as the car has higher compression (shaved head) and won't run on 91. I have to assume it was fresh going in...........

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Sounds like the o rings are the issue, if you can get some it's fairly easy to sort out. 

If you run the car the day before and then the next day undo the fuel lines to those injectors you should see there isn't any fuel inside the top of the injector which confirms it's bleeding past the o ring inside. 

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1 hour ago, TR674 said:

Mike, I use high octane as the car has higher compression (shaved head) and won't run on 91. I have to assume it was fresh going in...........

Most of us  have to use 98+ , but don't let the Australian stuff go stale in the tank. I add Stabil if I'm leaving the car unrun for more than a few weeks. Stale fuel will damage O rings and most other elastomers in the system.

Hope you've solved the problem.

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1 hour ago, Mike C said:

Most of us  have to use 98+ , but don't let the Australian stuff go stale in the tank. I add Stabil if I'm leaving the car unrun for more than a few weeks. Stale fuel will damage O rings and most other elastomers in the system.

Hope you've solved the problem.

To combat modern petrol all the elastomers  must be made out of 'Viton B' minimum or you will have problems. Only use PI parts that have the correct elastomers in them i.e. injectors &

MU's etc. old P.I. parts will fail & give you a lot of aggro.

Bruce.

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