Not a perfect fit for the evidence, but easy enough to check - possibly your vapor recovery system is partially blocked? Eventually a vacuum builds up in the tank making it impossible to pump enough gas. You check for it simply by popping open the gas cap when the symptoms occur. If you hear a whoosh of in-rushing air, then yep, you have a blocked vapor recovery system.
Good luck! "Other Greg" Rowe > From: gas...@roadrunner.com > To: spitfires@autox.team.net > Date: Wed, 21 Jul 2010 07:22:14 -0400 > Subject: [Spits] Sputtering when hot above 50 mph > > Sent this last night but I didn't know if it went through, I didn't see it. > Sorry if you received it twice. > > Thanks guys, > > I drove it last night and ran great. Had it up to 60 mph for about 20 miles. > Temperature was in the lower 70's. Maybe I didn't drive it long enough. When I > have trouble is when the temperature is in the 90's. > > Let me ask another question, could oil make the car run hotter. I did an oil > change and used Auto Zone brand oil. I usually use Valvoline oil. I still used > 20 W 50 like I always use. Just trying to think of things I did since problem > started. > > Also what is the reason for the spacer on the fuel pump? I heard two different > reasons. One is that it makes the fuel pump run a little cooler and the other > is you can use a fuel pump from a different model car (like a Chevy) that's > more common. > > I'm going to put a 160 degree thermostat in to see if that helps. Also going > to put a new fuel pump on but I can't understand why it only does it on a hot > day. Unless the fuel pump acts up when it gets hot? > > Matt, you wouldn't happen to be going to the Vintage Grand Prix at Pittsburgh > this weekend? I'll be there on Saturday but as of right now I wouldn't be > driving my Spitfire there. > > Greg > 1978 Spitfire 1500 > Ohio > __ _________________________________________________________________ Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL :en-US:WM_HMP:042010_2 _______________________________________________ Spitfires@autox.team.net Donate: http://www.team.net/donate.html Suggested annual donation $11.47 Archive: http://www.team.net/archive Forums: http://www.team.net/forums Unsubscribe/Manage: http://autox.team.net/mailman/options/spitfires/arch...@jab.org