Author Topic: What is the correct way to bleed air from the fuel system?  (Read 2385 times)

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What is the correct way to bleed air from the fuel system?
« on: September 11, 2010, 15:00:39 PM »
After refitting my repaired fuel sender and fuel lines on the V6, I refitted everything and then tried starting the Cally. She fired up straight away...brilliant. Only problem is, it then died 2 seconds later. I'm fairly sure its because there is now air in the fuel lines from me having just replaced them. Does this probable, or should the fuel still happily push the air through until it starts? I've tried several times but no joy.

If it is likely to be an air lock, can i simply release this air by depressing the valve on the fuel rail? Stupid question, but how do i know when to stop? Does fuel actually start coming out of the valve?

Or do i have to something else, such as disconnect the fuel line(s) at the engine, and turn the engine over until fuel starts coming through?

Just wanted the correct advice on this before i do anything as i'm not sure of the correct method, as not done this before. Looked in the Haynes manual but can't find a procedure on this.

TIA :)
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Re: What is the correct way to bleed air from the fuel system?
« Reply #1 on: September 11, 2010, 15:37:03 PM »
Further to the above, i tried turning the car 3 or 4 times, and then pressed the release valve on the fuel rail, and nothing happened.

I'm guessing that's not good.

Whilst waiting for any advice, i'm just going to disconnect the fuel filter, drain the excess fuel at that point. Refit it, and then try starting it again. I'll then disconnect the fuel filter again to see if more fuel comes out. I figure that will tell me if the fuel pump is pumping fuel up to that point in the fuel system.

Be back in a bit.
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Re: What is the correct way to bleed air from the fuel system?
« Reply #2 on: September 11, 2010, 16:19:10 PM »
Ok, i have disconnected the fuel hose from the fuel filter (ie the hose leading to the engine), and then turned the car over to see if fuel is being pumped from the tank, and out of the filter.

However, nothing is coming out, which doesn't look right to me. Can someone confirm if i should be seeing fuel coming out using this method?
'95 V6 (Diamond Black)
'97 V6 SE9

Offline lammy

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Re: What is the correct way to bleed air from the fuel system?
« Reply #3 on: September 11, 2010, 17:23:45 PM »
I would have thought that the 'air lock'?..would have been eliminated by turning the engine over with the fuel lines pressurised?..i.e...the fuel would be pushed through the lines to the fuel rail and the 'air lok' would go with it?

Offline CalibraTurbo666

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Re: What is the correct way to bleed air from the fuel system?
« Reply #4 on: September 11, 2010, 17:36:42 PM »
It should just vent out as you try to start it, are you sure the correct pipe is on the intake? , is the pump running?

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Re: What is the correct way to bleed air from the fuel system?
« Reply #5 on: September 11, 2010, 18:13:03 PM »
It should just vent out as you try to start it, are you sure the correct pipe is on the intake? , is the pump running?

Fairly sure the pump is ok, as i can hear and feel it working inside the tank, when the car is turning over.

I also took the fuel filter off completely (in the unlikely event it was blocking the flow) and still nothing is coming out of the pipe that is directly connected to the tank, when i turn the engine over. So can only think I must have put the pipes on the wrong way round on the sender unit, although i was certain i put them back on how they came off.

Didn't help that the marks i put on the sender lid in marker pen to remind me, were completely removed when i soaked it in vinegar lmao, so had to do it from memory.

Oh well time for the fecking tank to come off again grrr!!
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Re: What is the correct way to bleed air from the fuel system?
« Reply #6 on: September 11, 2010, 22:34:02 PM »
Ok i found the source of the problem. I had to take the fuel tank off again to find it.

See anything wrong with this picture?




Me being a muppet, i refitted the hoses to the sender lid, but forgot to secure them. As such, the main one that feeds the engine popped off under pressure, so the pump was pumping the fuel ok, but it was going right back into the tank lol. Soon as i fixed that it fired up straight away whoop whoop :)

I blame the kids (must have distracted me  ::)).
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Offline Bart

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Re: What is the correct way to bleed air from the fuel system?
« Reply #7 on: September 12, 2010, 14:32:03 PM »
Nice. Normally you can bleed air out of the fuel system using the vent on the fuel rail.
Memorable quotes: " 19 people in a cave made NORAD stand down ".

Offline Gav

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Re: What is the correct way to bleed air from the fuel system?
« Reply #8 on: September 12, 2010, 14:34:32 PM »
Yes you can, but not without the fuel pipe connected to the rail. :)

Nice one Mark, glad it was something simple. :D

Offline sealeysonic

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Re: What is the correct way to bleed air from the fuel system?
« Reply #9 on: September 12, 2010, 17:39:36 PM »
lol nice one mate glad u sorted it.