Fuel pump fittings

[Evan Carew]

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Do I need to get those special (straight thread) fittings for my fuel
pump or are the regular NPT AN fittings good enough.

Thanks,
Evan
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[Orval Fairbairn]

In article >,
Evan Carew > wrote:

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> Do I need to get those special (straight thread) fittings for my fuel
> pump or are the regular NPT AN fittings good enough.
>
> Thanks,
> Evan
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Normally, fuel pumps have NPT ports, so you uce AN with the appropriate
NPT size on one end.

[Dave Hyde]

Evan Carew wrote...

> Do I need to get those special (straight thread) fittings for my fuel
> pump or are the regular NPT AN fittings good enough.

I suppose it depends on what kind of fuel pump you're
referring to. If it's the Delco mechanical pump
on tons o' Lycomings, you need special fittings.
See:

http://www.vansaircraft.com/cgi-bin/catalog.cgi?ident=1096428757-268-372&bro
wse=engines&product=pump-fittings

Or if that gets chppoed, go to www.vansaircraft.com,
find the accessory catalog, and search for fuelpump fittings.

Dave 'thread head' Hyde

[jls]

"Dave Hyde" > wrote in message
...
> Evan Carew wrote...
>
> > Do I need to get those special (straight thread) fittings for my fuel
> > pump or are the regular NPT AN fittings good enough.
>
> I suppose it depends on what kind of fuel pump you're
> referring to. If it's the Delco mechanical pump
> on tons o' Lycomings, you need special fittings.
> See:
>
>
http://www.vansaircraft.com/cgi-bin/catalog.cgi?ident=1096428757-268-372&bro
> wse=engines&product=pump-fittings
>
> Or if that gets chppoed,

Well, not chppoed but chipotled maybe


go to www.vansaircraft.com,
> find the accessory catalog, and search for fuelpump fittings.
>
> Dave 'thread head' Hyde
>
>
>
>

[Evan Carew]

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Orval,

Well, I just received a shipment of standard AN fittings with NPT on one
site & I can say that these definately don't fit. Sigh. Order and wait
another week.

Evan

Orval Fairbairn wrote:
> In article >,
> Evan Carew > wrote:
>
>
> Do I need to get those special (straight thread) fittings for my fuel
> pump or are the regular NPT AN fittings good enough.
>
> Thanks,
> Evan

> Normally, fuel pumps have NPT ports, so you uce AN with the appropriate
> NPT size on one end.

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[Jerry J. Wass]

Have you tried an AN fitting in the hole--if it's recessed for an "O"
ring then use
an AN union + O-ring---may have to cut off the flare if it won't go all
the way in.
(they make special fittings like this,(esp. for hydraulic pumps) but I
never have one when I need it

Evan Carew wrote:

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> Do I need to get those special (straight thread) fittings for my fuel
> pump or are the regular NPT AN fittings good enough.
>
> Thanks,
> Evan
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[Evan Carew]

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Jerry,

What kind of o-ring is used?

Evan

Jerry J. Wass wrote:
> Have you tried an AN fitting in the hole--if it's recessed for an "O"
> ring then use
> an AN union + O-ring---may have to cut off the flare if it won't go all
> the way in.
> (they make special fittings like this,(esp. for hydraulic pumps) but I
> never have one when I need it
>
> Evan Carew wrote:
>
>
> Do I need to get those special (straight thread) fittings for my fuel
> pump or are the regular NPT AN fittings good enough.
>
> Thanks,
> Evan
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[Dave Hyde]

Evan Carew wrote...

> What kind of o-ring is used?

*sigh*

http://www.aircraftspruce.com/catalog/eppages/contlycfuelpump.php
See bottom of page.

http://www.wicksaircraft.com/catalog/product_cat.php/subid=2641/index.html

http://www.vansaircraft.com/cgi-bin/catalog.cgi
and search for 'fuel pump fittings'

http://www.chiefaircraft.com/cgi-bin/search/search-air.cgi
and search for 'fuel pump hardware'

I'm sure there are more.

Dave 'fitting end' Hyde

[Evan Carew]

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Dave,

Yeah, I've been to those exact pages, & will note for the record that
none of those pages mention an o-ring for sale, however, the pictures do
indicate that the parts come with said o-ring. If not, like I said, I
would like to know the particulars for when I go a calling the very well
informed A&S sales people (tongue firmly in cheek here).

Dave Hyde wrote:
> Evan Carew wrote...
>
>
>>What kind of o-ring is used?
>
>
> *sigh*
>
> http://www.aircraftspruce.com/catalog/eppages/contlycfuelpump.php
> See bottom of page.
>
> http://www.wicksaircraft.com/catalog/product_cat.php/subid=2641/index.html
>
> http://www.vansaircraft.com/cgi-bin/catalog.cgi
> and search for 'fuel pump fittings'
>
> http://www.chiefaircraft.com/cgi-bin/search/search-air.cgi
> and search for 'fuel pump hardware'
>
> I'm sure there are more.
>
> Dave 'fitting end' Hyde
>
>
>
>
>

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[Dave Hyde]

Evan Carew wrote...

> Yeah, I've been to those exact pages, & will note for the record that
> none of those pages mention an o-ring for sale...

You might note that none of the fittings pictured are
simple 37 deg flare to NPT fittings - there's
a wider bearing surface for the O-ring/NPT end.
The Lycoming standard solution does _not_ appear to
be to stuff an O-ring over an NPT fitting, cut down
or otherwise.

Dave 'field mod' Hyde

[GeorgeB]

On Thu, 30 Sep 2004 20:55:48 -0400, Evan Carew >
wrote:

>Dave,
>
>Yeah, I've been to those exact pages, & will note for the record that
>none of those pages mention an o-ring for sale, however, the pictures do
>indicate that the parts come with said o-ring. If not, like I said, I
>would like to know the particulars for when I go a calling the very well
>informed A&S sales people (tongue firmly in cheek here).

OK, a hydraulic guy here ... don't know if oyu are after rubber type
or size.

These are what are normally called "SAE" fittings and use (usually) a
90 durometer nitirle material. It looks like they are SAE #6 (thread
is 3/8-24), but just for grins,

size thrd ID section
-4 7/16-20 .351 .072
-5 1/2-20 .414 .072
-6 9/16-20 .468 .078
-8 3/4-16 .644 .087

These do not appear to be in the AS568A dash number series but are
available at any fluid power fitting source.

George

[Evan Carew]

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George,

I had a feeling they were SAE threads as a common SAE tap set I have
lying around fit the threads. Thanks also for the info on the o-rings.
Sometimes its difficult to get the kind of detailed info you need to
talk to a salesperson who doesn't know their product line. Its good to
see that there are at least a few people who can help out on this
subject from this news group.

Evan

GeorgeB wrote:
> On Thu, 30 Sep 2004 20:55:48 -0400, Evan Carew >
> wrote:
>
>
>>Dave,
>>
>>Yeah, I've been to those exact pages, & will note for the record that
>>none of those pages mention an o-ring for sale, however, the pictures do
>>indicate that the parts come with said o-ring. If not, like I said, I
>>would like to know the particulars for when I go a calling the very well
>>informed A&S sales people (tongue firmly in cheek here).
>
>
> OK, a hydraulic guy here ... don't know if oyu are after rubber type
> or size.
>
> These are what are normally called "SAE" fittings and use (usually) a
> 90 durometer nitirle material. It looks like they are SAE #6 (thread
> is 3/8-24), but just for grins,
>
> size thrd ID section
> -4 7/16-20 .351 .072
> -5 1/2-20 .414 .072
> -6 9/16-20 .468 .078
> -8 3/4-16 .644 .087
>
> These do not appear to be in the AS568A dash number series but are
> available at any fluid power fitting source.
>
> George

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[Blueskies]

All the fittings are here:
http://www.parker.com/tfd/cat/pdffiles/C-Triple-Lok.pdf

Packings, seals and materials are here:
http://www.parker.com/o-ring/Literature/00-5700.pdf

I work for Parker, so I am biased somewhat....


"Evan Carew" > wrote in message ...
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>
> George,
>
> I had a feeling they were SAE threads as a common SAE tap set I have lying around fit the threads. Thanks also for the
> info on the o-rings. Sometimes its difficult to get the kind of detailed info you need to talk to a salesperson who
> doesn't know their product line. Its good to see that there are at least a few people who can help out on this subject
> from this news group.
>
> Evan
>
> GeorgeB wrote:
>> On Thu, 30 Sep 2004 20:55:48 -0400, Evan Carew >
>> wrote:
>>
>>
>>>Dave,
>>>
>>>Yeah, I've been to those exact pages, & will note for the record that none of those pages mention an o-ring for sale,
>>>however, the pictures do indicate that the parts come with said o-ring. If not, like I said, I would like to know the
>>>particulars for when I go a calling the very well informed A&S sales people (tongue firmly in cheek here).
>>
>>
>> OK, a hydraulic guy here ... don't know if oyu are after rubber type
>> or size.
>>
>> These are what are normally called "SAE" fittings and use (usually) a
>> 90 durometer nitirle material. It looks like they are SAE #6 (thread
>> is 3/8-24), but just for grins,
>>
>> size thrd ID section
>> -4 7/16-20 .351 .072
>> -5 1/2-20 .414 .072
>> -6 9/16-20 .468 .078
>> -8 3/4-16 .644 .087
>>
>> These do not appear to be in the AS568A dash number series but are
>> available at any fluid power fitting source.
>>
>> George
>
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[GeorgeB]

On Sat, 02 Oct 2004 01:20:11 GMT, "Blueskies" > wrote:

>All the fittings are here:
>http://www.parker.com/tfd/cat/pdffiles/C-Triple-Lok.pdf
>
>Packings, seals and materials are here:
>http://www.parker.com/o-ring/Literature/00-5700.pdf
>
>I work for Parker, so I am biased somewhat....

I worked for a Parker distributor and got the dims from that catalog.
You folks are GREAT.

I've since found that the SAE o-rings are to 568-9xx series where xx
is the 2 digit dash number (nominal tube OD in 1/16" units). I listed
the ones for the dimensions I gave below with the eimensions.

>> I had a feeling they were SAE threads as a common SAE tap set I have lying around fit the threads. Thanks also for the
>> info on the o-rings. Sometimes its difficult to get the kind of detailed info you need to talk to a salesperson who
>> doesn't know their product line. Its good to see that there are at least a few people who can help out on this subject
>> from this news group.
>>
>>>>Yeah, I've been to those exact pages, & will note for the record that none of those pages mention an o-ring for sale,
>>>>however, the pictures do indicate that the parts come with said o-ring. If not, like I said, I would like to know the
>>>>particulars for when I go a calling the very well informed A&S sales people (tongue firmly in cheek here).
>>>
>>> These are what are normally called "SAE" fittings and use (usually) a
>>> 90 durometer nitirle material. It looks like they are SAE #6 (thread
>>> is 3/8-24), but just for grins,
>>>
>>> size thrd ID section
>>> -4 7/16-20 .351 .072
568-904

>>> -5 1/2-20 .414 .072
568-905

>>> -6 9/16-20 .468 .078
568-906

>>> -8 3/4-16 .644 .087
568-908

[Bob Olds]

"Dave Hyde" > wrote in message >...
> Evan Carew wrote...
>
> > Yeah, I've been to those exact pages, & will note for the record that
> > none of those pages mention an o-ring for sale...
>
> You might note that none of the fittings pictured are
> simple 37 deg flare to NPT fittings - there's
> a wider bearing surface for the O-ring/NPT end.
> The Lycoming standard solution does _not_ appear to
> be to stuff an O-ring over an NPT fitting, cut down
> or otherwise.
>
> Dave 'field mod' Hyde
>



************************************************** *****************************


That fuel punp fitting must have a nut to clamp down on the "O" ring.
This compresses the "O"ring and locks the fitting in place.

Bob Olds RV-4
A&P , EAA Tech. Counselor
Charleston,Arkansas




************************************************** *****************************

[GeorgeB]

On 2 Oct 2004 18:19:14 -0700, (Bob Olds) wrote:

>That fuel punp fitting must have a nut to clamp down on the "O" ring.
>This compresses the "O"ring and locks the fitting in place.

That nut is only used on fittings that have to be adjustable ...
typically 45 and 90 degree. The straights, IME, don't have one.