How Do I Bleed Air Out Of My Qsc Fuel Filter?
- #1
Yesterday I changed the CAV 296 filter on my Beta BZ482.
After it was fitted I re-opened the main fuel valve from the tank to the filter. Fuel would not refill the filter but bubbled out through the bleed spiral on the superlative of the filter fitting.
I spoke to Scott at TS Marine who had fitted the engine. He said that was good as information technology meant that the re-fitted filter and glass bowl were air and fuel tight and the fuel was just taking the line of least resistance. He told me to screw the breather down and then bleed the fuel line at the fine filter assembly where in that location was a sabbatical or at the injector.
When Scott fitted the engine he did a smashing job only unfortunately he had to fit the fine fuel filter in an inaccessble place so I had to drain the air out at the injector.
I seemed to take to bleed loads of fuel out before I got all of the air out.
Am I right in thinking that to get the air out of the CAV filter all of the fuel in the fuel line from the primary filter plus the fuel in the fine filter plus the fuel in the HP pump had to exist hand pumped out with the fuel lift pump.
It was actually hard trying to collect all this fuel at the injector. I used loads of rags and still some managed to escape.
Whatever advice would be appreciated. If any one has an idiots guide to irresolute a CAV Filter. that would also be appreciated.
PS There is no chance of me changing the filter to a Racor every bit I know at that place has been word about the claim/demerits between Racor and CAV
- #2
Sounds like you're not having the problem I had haemorrhage my Beta 22. After literally hours of pumping the lift pump by hand I chosen Beta to be told that unless the engine is in just the right position, the manual lift lever is likely doing zilch at all, and I was improve off pre-filling the filter with fuel before screwing on and turning the engine over for no more 10 seconds at a time, with a long look between times, until information technology self-bled. This worked fine.
Only.
Afterwards I installed one of those squeezy priming bulbs in the fuel line between the fuel tank and the showtime (CAV) type fuel filter and then that it would never be a problem in the time to come as I could and so apply that to button fuel up and through the system to the bleed indicate.
Beta tech support are very helpful on the telephone. Used them a few times.
- #iii
ksutton
Member
- Joined
- 29 Jul 2005
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- 908
Exercise you not accept a bleed screw on the fuel injection pump? maybe your engineer meant the injector pump bleed screw and not the actual injector. Can imagine your frustration trying to bleed the whole arrangement out of an injector!! Your primary filter bleed screw should besides exist made more accessible, you may need to get at that this in a hurry when at sea if yous need to bleed air.
- #4
ianj99
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I fitted an electric lift pump side by side to the tank - it makes bleeding the air out a doddle.
- #5
Information technology was made even more than frustrating every bit the final fourth dimension later on I changed the primary filter I merely opened main fuel cock with the bleed screw on the filter open and when information technology overflowed closed it. When I gunned the engine information technology fired upward after a couple of coughs.
I cannot understand why this time fuel wasnt going into the filter but by passing information technology straight to the bleed screw and spewing out.
- #6
Personally I find bleeding the fuel system on all the diesel engines hither, via the injectors, far easier than anything else. Prime the filter, do everything upwardly, crevice off the fuel line on 1 injector, plow engine over on the cardinal, once engine starts, tighten injector.
Doing information technology this way ensures in that location is no air left in the system equally the injector is the highest function of the fuel line, saves cramp in mitt/arm as the transmission lift pump is almost always hard to get to and needs loads of pumping!
- #7
I dont know your engine but I have Volvo D6s.
One needed bleeding ( ok well it was my fault as I ran it out of fuel - merely besides I have 2). No trouble thinks I. Open valve, pump, air out, task done.
Would not start.
Got out the instructions. In essence do the above AND then pump x more times. Result, plough fundamental and all is well.
Just an idea! As my dad says "if all else fails read the instructions"
- #eight
ksutton
Member
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- 29 Jul 2005
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- 908
Before attempting to change your CAV 296 filter side by side time when its due, turn off the principal fuel tap first. This holds the line from the fuel tank stack pipe full of fuel. And so after renewing the filter open the CAV filter bleed screw before turning the fuel tap back on. You should see the filter make full quite speedily, assisted past siphon activeness from the pre filled fuel line.
This was probably non possible for you lot subsequently getting the CAV filter fitted from new and you lot could have had an air lock after having a completely emptied full line back to tank. But yous will have to locate and open up the bleed screw on your primary filter or injection pump also, otherwise in that location will be nowhere for the air to get from your empty CAV bowl.
The drain screw on the top of the CAV filter volition vent air from the tank to the filter. The bleed screw on your chief filter will demand to be open to vent air from the CAV bowl.
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- #9
lw395
Well-known member
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- xvi May 2007
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- 42,084
Surely crnking a diesel fuel on the starter for long enough to fill a CAV filter is going to flatten the battery and overheat the starter motor?
The priming bulb is the best way.
Some other adept way is to fill the CAV via the bleed screw using a syringe or squeezy bottle.
If you take shut off taps either side of the CAV, the last filter and lines should not take much air in.
The crook'southward way is to pressurise the fuel tank either past filling it higher up the level of the CAV or pumping air into the vent hose.
If the lines are empty, pulling some fuel through with a pela or big syringe works well.
The transmission lift pump lever worked OK on my Yanmar 3GM.
- #10
lw395
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That just works if the fuel level in the tank is above the CAV bleed spiral.
On my impala, it was a uncomplicated job to detach the CAV from the bulkhead and get it low enough to drain as you say. A chip nasty as it involves all the pipes being flexed a lot.
- #xi
I have a Pela Oil extractor, which operates past vacuum. I fit a nipple which fits the bleed point on the injector pump filter bank. Information technology takes about 30 seconds to get all the air out. The diesel in the Pela is returned to the fuel tank.
A couple of cranks to prime number the injector pump and then scissure no one cylinder injector nut, to get any air out, and then away she goes.
I have 2x 4 litre engines with iv CAV 296 filters (each) then in that location is quite a scrap or air to suck through, using a lift pump manual tickler system, hence the employ of the Pela
- #12
I described a similar situation in a thread I posted (.... not interesting to anyone - 'cos I had no replies 
)
My principal filter filled ok ..... but the lift pump did nothing and my second filter remain fuel-less.
Truthful to the brusk-cutting amateur that I am, I thought I'd fill up the filter, turn the engine over to pump information technology through a fiddling and it simply started later on a few cranks........and it seems fine (famous terminal words)
In case it helps: http://world wide web.ybw.com/forums/showthread.php?t=318187
- #13
pvb
Well-known fellow member
Are you saying that the engine has been inverse since the last time you changed the primary filter? If so, might your engine fitter take plumbed your CAV filter the other style round?
- #xiv
I did the same. Pump came from eBay, made in India, appears to be the aforementioned as sold past ASAP Marine (except for the price!). Pressuring the fuel line seems to be the way to go.
- #fifteen
………and fill the engine exhaust with h2o from the Jabsco and we know what happens then.
- #16
I have the 296 type filters besides, I find it helps once you've swapped the chemical element and er-assembled to burn up the engine and allow it idle, the lift pump will pull through the fuel.
Sometimes it pulls through the fuel quick enough and self bleeds, other times information technology konks out, in those cases you've got less manual priming to practise as its already doen some of information technology itself.
- #17
bendyone
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Long story but I have had problems with air getting into the fuel line, in the end I replaced the lot and fitted a filter with a primer pump built in. Primes the arrangement without whatever problems. The transmission lift pump was difficult to accomplish and very slow, also the engine had to be in a sure position for the pump to piece of work.
From here http://www.ssldieselparts.co.uk/primer-with-filter-deep-basin-p-705.html £24
- #18
IF your battery tin can't turn the engine over for about 30 seconds, then I would accept said the battery is duff! I have never managed to flatten a battery while priming upwards the fuel system, and neither should the starter overheat. I am not talking almost constant cranking for 5 mins, a couple of 20 2nd cranks and the engine will be running. Simply everyone has dissimilar methods of doing the aforementioned matter.
I am puzzled as to why your toilet is connected to your exhaust Graham???
- #nineteen
No the engine hasn't been changed between filter changes. Last fourth dimension as I said the fuel slowly filled the filter and then I turned off the breather on the peak of the filter housing. This time as I said the fuel refused to flow into the filter despite the breather beingness open.
It has since been suggested to me that I should 'crack' centre holding bolt off a flake to permit the air to be displaced.
- #xx
If your filter is anything like mine, I can't come across how fuel emerges from the breather without first filling the filter, since the breather is at the uppermost bespeak of the housing.
Seems very strange, and I would question how the filter has been re-assembled. Can't run into how loosening the holding bolt would assist.
How Do I Bleed Air Out Of My Qsc Fuel Filter?,
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