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D4 7u fuel transfer pump

D4 7u fuel transfer pump

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dflect1
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running my relatively new toy on some steep terrain and had fuel problem. assumed fuel tank pick up issue. limped it back to fuel up .
after fueling up tried to bleed out system little or no fuel. disconnect line at fuel pump. lots of fuel. take pressure check out mucho crap.
spring good check seal seems ok. thinking about pulling transfer pump to see if a bunch of crap is clogging it up but nervous about
removal? four bolts on bottom of housing off, smack a good lick, still doesn't want to move?

Any help here would be appreciated.

Thank you fellas.
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Sun, Mar 12, 2017 2:15 AM
dpendzic
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how about the fuel filters and housing being plugged up??
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Sun, Mar 12, 2017 4:12 AM
dflect1
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Reply to dpendzic:
how about the fuel filters and housing being plugged up??
housing drained cleaned and blown out . fuel filters new .
the problem now seems to be no fuel to bleed system period.
Hence transfer pump?
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Sun, Mar 12, 2017 4:42 AM
ag-mike
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Reply to dflect1:
housing drained cleaned and blown out . fuel filters new .
the problem now seems to be no fuel to bleed system period.
Hence transfer pump?
[quote="dflect1"]housing drained cleaned and blown out . fuel filters new .
the problem now seems to be no fuel to bleed system period.
Hence transfer pump?[/quote]

or the line going to the pump. i seen them 7/8 full of crap at the lowest spot, not necessarily at the pump.
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Sun, Mar 12, 2017 5:47 AM
dflect1
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Reply to ag-mike:
[quote="dflect1"]housing drained cleaned and blown out . fuel filters new .
the problem now seems to be no fuel to bleed system period.
Hence transfer pump?[/quote]

or the line going to the pump. i seen them 7/8 full of crap at the lowest spot, not necessarily at the pump.


fuel line while disconnected from transfer pump/ check housing pours out like a hose.
there was considerable sediment in the intake orifice of housing between
fuel line and check assembly.
discovered clean out gallery above hour meter, flushed out through
filter housing.

Does fuel enter filter housing through pipe against back of housing?

How do I remove transfer pump for an inspection?
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Sun, Mar 12, 2017 7:25 AM
Old Magnet
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Reply to dflect1:


fuel line while disconnected from transfer pump/ check housing pours out like a hose.
there was considerable sediment in the intake orifice of housing between
fuel line and check assembly.
discovered clean out gallery above hour meter, flushed out through
filter housing.

Does fuel enter filter housing through pipe against back of housing?

How do I remove transfer pump for an inspection?
Did you fill the filter tower with fuel after changing the filters or are you depending on the transfer pump to fill the tower? Yes fuel enters the tower through a tube that discharges just below the filter support flange.
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Sun, Mar 12, 2017 8:01 AM
dflect1
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Reply to Old Magnet:
Did you fill the filter tower with fuel after changing the filters or are you depending on the transfer pump to fill the tower? Yes fuel enters the tower through a tube that discharges just below the filter support flange.


after the initial hic up. after fueling up while trying to restart I noticed absolutly no fuel pressure.
then open housing to inspect filters and noticed that it is low so added a quart of clean
fuel so it spilled over when the filters went in. then restarted pony, lever in start, throttle
closed, all bleeders open after a few minute's small amounts of fuel out of bleeder on face of housing, close it, but
no fuel out of top of housing?
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Sun, Mar 12, 2017 8:15 AM
Old Magnet
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Reply to dflect1:


after the initial hic up. after fueling up while trying to restart I noticed absolutly no fuel pressure.
then open housing to inspect filters and noticed that it is low so added a quart of clean
fuel so it spilled over when the filters went in. then restarted pony, lever in start, throttle
closed, all bleeders open after a few minute's small amounts of fuel out of bleeder on face of housing, close it, but
no fuel out of top of housing?
You need to bleed in sequence, filter tower first both above and below filter deck then do the pumps one at a time. Applying low air pressure back at the fuel tank filler neck will help speed up the process. You won't see much in the way of fuel pressure with bleeders open.
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Sun, Mar 12, 2017 8:29 AM
AndrewM
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Reply to dflect1:


fuel line while disconnected from transfer pump/ check housing pours out like a hose.
there was considerable sediment in the intake orifice of housing between
fuel line and check assembly.
discovered clean out gallery above hour meter, flushed out through
filter housing.

Does fuel enter filter housing through pipe against back of housing?

How do I remove transfer pump for an inspection?
[quote="dflect1"]fuel line while disconnected from transfer pump/ check housing pours out like a hose.
there was considerable sediment in the intake orifice of housing between
fuel line and check assembly.
discovered clean out gallery above hour meter, flushed out through
filter housing.

Does fuel enter filter housing through pipe against back of housing?

How do I remove transfer pump for an inspection?[/quote]

Yes the fuel enters through a port at the back of the transfer pump sealed by an o-ring,
my 7u has a similar problem, engine would miss at low idle and really sluggish top end due to the low fuel pressure, tried all the obvious things first than pulled the transfer pump off and striped it down and the gears had chewd out the body of the pump, now waiting on parts from cat, nearly everything I needed was available, my pump was also extremely hard to remove, took a fair force to the point that I thought i was going to break something.
your sure you have removed the correct four bolts? mine had two bolts that went threw the whole pump and two studs with nuts that only went threw the most inner part of the pump,

good luck!
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Sun, Mar 12, 2017 8:32 AM
Old Magnet
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Reply to AndrewM:
[quote="dflect1"]fuel line while disconnected from transfer pump/ check housing pours out like a hose.
there was considerable sediment in the intake orifice of housing between
fuel line and check assembly.
discovered clean out gallery above hour meter, flushed out through
filter housing.

Does fuel enter filter housing through pipe against back of housing?

How do I remove transfer pump for an inspection?[/quote]

Yes the fuel enters through a port at the back of the transfer pump sealed by an o-ring,
my 7u has a similar problem, engine would miss at low idle and really sluggish top end due to the low fuel pressure, tried all the obvious things first than pulled the transfer pump off and striped it down and the gears had chewd out the body of the pump, now waiting on parts from cat, nearly everything I needed was available, my pump was also extremely hard to remove, took a fair force to the point that I thought i was going to break something.
your sure you have removed the correct four bolts? mine had two bolts that went threw the whole pump and two studs with nuts that only went threw the most inner part of the pump,

good luck!
If you must remove the pump there are two nuts on the short studs next to the engine.
One nut on a short stud on outside rear of pump
One cap screw on the outside front position on the pump.
Pump needs to come straight out.

You never indicated what the fuel pressure was so you may be wasting the effort removing the pump.
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Sun, Mar 12, 2017 8:49 AM
edb
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Reply to Old Magnet:
If you must remove the pump there are two nuts on the short studs next to the engine.
One nut on a short stud on outside rear of pump
One cap screw on the outside front position on the pump.
Pump needs to come straight out.

You never indicated what the fuel pressure was so you may be wasting the effort removing the pump.
Hi Team,
it has happened before that the tower cover and spacer/filter mount plate gaskets have been incorrectly fitted.
If this occurs the fuel drilling in the tower body is blocked and fuel and therefore pressure is stopped from entering the tower and/or the injection pump gallery, depending which gasket may be mis-installed/orientated.
True a worn out pump/weak bypass pressure relief spring or relief valve/button/seat will not help either.
Cheers,
Eddie B.
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Tue, Mar 14, 2017 11:35 AM
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