Thread: Some help please

you can do some hefty damage to the head as the combustion gases scour past the seals into the fuel gallery.

If you're very lucky it might just be a fuel pressure regulator jammed full open thats robbing you of fuel pressure.

to check...

grab a couple of jerries of diesel and fill your car up at a servo. park it with the filler up nice and high then start topping the tank off till its absoluety "any more and it would have a meniscus" full. with the engine warm crank it up while someone watches the filler. if it starts to blow fuel out you've got air under pressure in the fuel system. top it up slowly while its running and you'll start to see bubbles if the injectors are suffering blow past. ( you may need to give it the Italian treatment with the noisey pedal a couple of times.)

if the fuel level remains unchanged its most likely a combination of the FPR not doing its job properly and the LP side of the pump not providing sufficient flow to the HP side which is in turn robbing you of gallery pressure in the engine.

more diagnostics.....

try this....

with the engine stone cold.

carry out the priming sequence, Dont start it tho.

after the hold the pedal down with the key in the run position thing let the fuel pump time out. (you'll hear it)

turn the key off on, Time the fuel pump.
turn the key off on, 2 seconds short of the pump timing out hold it flat and hit the starter while someone watches the exhaust

it should start in about 2 seconds of cranking. If it blows out a puff of white smoke or more than the normal amount of startup black smoke you have a leaking injector seal. if it starts immediately then you're loosing prime in the fuel gallery from somewhere.

take the return line off of the FPR (or off at the tank) and fit up bit of clear fuel line so you can watch whats coming out. if you get bubbles while the engine is not running then the pump is cavitating air into the system. If it bubbles when the engine is running then you're getting air in while the injectors are firing OR the extra volts from the alternator running is causing the pump to cavitate.. To prove that hook the vehicle up as you would for a jump start and have the other car running at high idle while you repeat the test.