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Fuel Pump

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tiger862(at)ligtel.com
Guest

Posted: Sat Jun 30, 2007 9:53 am Post subject: Fuel Pump

Doing a major on a 1978 Tiger when we purchased the  fuel pump for it we found that the part number had been changed several  times.  Did not think much about it until we received the pump and found  that the housing was to long and would not fit above the carb. to get the engine  back on.  It took three tries to get the right pump, which we finally found  one with the old part number and lucky for me it worked.  Anyone else run  into this, or is this old news and we just didn't know what was going on?   Thanks Chad

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ktusha(at)gpcom.net
Guest

Posted: Sat Jun 30, 2007 12:08 pm Post subject: Fuel Pump

Yes, I had the same problem.  The overhaul  shop was unaware of the non-standard pump and it took probably  2 days of  mechanics time (strung out over a week) to get to the bottom of it.  Royal  PITA.  Yes, I guess it was old news but I and all those working with me  were unaware of the problem.

  

 Ken Tusha

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sat Jun 30, 2007 10:14 pm Post subject: Fuel Pump

To the best of my knowledge, the only change of which I'm aware is a 

fuel pump with the outlet very close to the engine mount.  This can be 

corrected with the right fitting.

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_________________
Gary
AuCountry Aviation
Home of Team Grumman

flyv35b(at)minetfiber.com
Guest

Posted: Sun Jul 01, 2007 5:53 am Post subject: Fuel Pump

 	  Quote: 	
		   Yes, I had the same problem. The overhaul

 shop was unaware of the non-standard pump and it took probably 2 days of

 mechanics time (strung out over a week) to get to the bottom of it. Royal

 PITA. Yes, I guess it was old news but I and all those working with me

 were unaware of the problem.


	


It is old news, and Lycoming Service Instruction 1110C, dated April 10, 

1987, details the modification to the HA-6 carburetor to prevent the 

interference with the new AC fuel pump LW-16335 which replaced the older 

75246 fuel pump.  The O-360-A4K engine is specifically mentioned.  This 

required milling a small area near the idle mixture screw on the top of the 

carburetor and most likely could be done with a die grinder/rotary burr 

without removing the carburetor when the fuel pump is off.  Shouldn't have 

taken more than about an hour to do!  (hope you didn't have to pay for 2 

days of labor!)  The port locations on the new pump were clocked differently 

and required a new stainless steel fuel line to the carburetor (not relevant 

if you installed a fuel flow transducer in the line using hoses).



A lot of people probably got caught up in this change and paid extra money 

because the shop didn't subscribe to the $35/yr Lycoming Service Bulletins, 

Instructions and Letters.



Cliff  A&P/IA

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