My 75 fl keeps cutting out!

All Panhead related topics
Post Reply
Olde blue
Posts: 3
Joined: Tue Jun 12, 2018 4:55 am
Bikes: 68 shovelhead - project..... 75 shovelhead FLH - rider......85 sportster xl - rider
Location: Toronto ontario

My 75 fl keeps cutting out!

#1

Post by Olde blue » Thu Jul 05, 2018 7:51 pm

Panhead people
My 75 fl keeps cutting out !
Timing good..plugs good...points and gap good !
S&S super B carb keeps flooding out (actually dripping gas)
Massive suction vacume at right side tank cap....took out spring on vent...no pressure build up...bike runs great !
Buddy says "no no no "
Fuel system needs pressure...

Please give me your thoughts or experience ?
Old blue



Scrap
Site sponsor
Site sponsor
Posts: 613
Joined: Fri Jul 03, 2009 7:07 am
Bikes: 1957 FL
1980 FLT
74 FXE
2017 road glide
1971 Bonneville
Location: Pawtucket
Has thanked: 11 times
Been thanked: 28 times

Re: My 75 fl keeps cutting out!

#2

Post by Scrap » Thu Jul 05, 2018 8:30 pm

Fuel injected systems need pressure. Maybe your buddy is young enough to never have had an engine with a carburetor. You need to have a vented cap.

RUBONE
Moderator
Posts: 5149
Joined: Sat Nov 15, 2008 4:09 am
Bikes: Multiple H-D, Ducati, BMW, Triumph, BSA,...
Has thanked: 16 times
Been thanked: 507 times

Re: My 75 fl keeps cutting out!

#3

Post by RUBONE » Thu Jul 05, 2018 8:47 pm

As Scrap says, the carb system just uses gravity to feed, no pressure involved.

awander
Site sponsor
Site sponsor
Posts: 1245
Joined: Fri Sep 21, 2007 3:03 am
Bikes: '52 FL
'64 FLH
Has thanked: 9 times
Been thanked: 53 times

Re: My 75 fl keeps cutting out!

#4

Post by awander » Thu Jul 05, 2018 9:11 pm

Cutting out...How? When? Any pattern to it?

blewcrab
Site sponsor
Site sponsor
Posts: 233
Joined: Mon Jul 09, 2012 11:08 pm
Bikes: 65FL and 2003 heritage
Location: Southern Maryland
Has thanked: 15 times
Been thanked: 16 times

Re: My 75 fl keeps cutting out!

#5

Post by blewcrab » Thu Jul 05, 2018 10:01 pm

check float setting ...needle and seat . Sounds like your flooding out

cant-drive-55
Posts: 28
Joined: Sun Jul 30, 2017 4:02 am
Bikes: 59FLH, 76FXE
Location: chicago
Been thanked: 1 time

Re: My 75 fl keeps cutting out!

#6

Post by cant-drive-55 » Sat Jul 07, 2018 3:16 pm

Check the gas valve (needle). The rubber portion may not be sealing. Not sure if the 'B' has the check balls and O rings like the Super E, if so these can can cause issues. Perhaps some crud needs to be cleaned caused from the awesome gas we have to use.

Post Reply

Return to “Panhead”