If it were my car I'd want to know why it was too high and fix that rather than throw a band aid on the problem with a AFPR
JMHO Larry Alster 91 Miata White Knight 92 Miata Silver Bullet (Sold but not forgotten) 92 Miata Honey B 04 MSM MX-5 Whooosh 06 WRX STi Subie 08 Z06 Corvette (As yet unnamed) From: [email protected] [mailto:[email protected]] On Behalf Of fast G Sent: Sunday, April 01, 2012 8:42 PM To: Bill Cardell Cc: [email protected] Subject: Re: Miata based Lotus 7 It does have the stock ECU and injectors. But how would the excessive pressure screw up the hot start? So you think I should get an adjustable Fuel Pressure regulator so I can get it back down to 59? Graham On Sun, Apr 1, 2012 at 7:35 PM, Bill Cardell <[email protected]> wrote: If you're running stock ecu and injectors it won't be happy with 75 psi. Stock is 59 psi. Bill Cardell Owner, Flyin' Miata Www.flyinmiata.com 1-800-FLY-MX5s 970-464-5600 On Apr 1, 2012, at 4:06 PM, "fast G" <[email protected]> wrote: I checked the fuel pressure as it leave the tank, it's 75psi will a running engine. I have not been able to re-create the hot start issue, the car is still up on saw horses, but I should have it back on the ground next weekend. I was kinda hoping that the fuel pressure would be low as it would give me something to fix. What would be your best guess? Graham On Sun, Apr 1, 2012 at 6:05 PM, fast G <[email protected]> wrote: On Tue, Mar 27, 2012 at 2:27 PM, Ken Bogart <[email protected]> wrote: I would plumb one inline on the hose going to the fuel rail. First determine if your tank is venting by checking gas cap. I would release the pressure and see if it starts. Is it under pressure or vacuum? Ken Bogart ----------------------------------------------------- 96 Montego Blue FFS Coldside (His) 97 Black & Tan (Hers) 90 Crystal White (sons) ------------------------------------------------------ http://www.miatacare.com http://www.cincimiata.com MiataMail.com list owner On Tue, Mar 27, 2012 at 3:24 PM, fast G <[email protected]> wrote: I am not sure that I have any FPR at all. I can see nothing in the tank apart from the pump. It should be running again this week. What is the simplest way to get a fuel pressure gauge into the fuel line? Graham On Tue, Mar 27, 2012 at 2:10 PM, Ken Bogart <[email protected]> wrote: Have you checked fuel pressure under the running, hot and not so hot conditions? The NB has a returnless system, the FPR is essentially on the fuel pump end. The dampener is supposed to accommodate pulsations, but does not control pressure. What if you loosen gas cap? does it suck or blow under this condition? Ken Bogart ----------------------------------------------------- 96 Montego Blue FFS Coldside (His) 97 Black & Tan (Hers) 90 Crystal White (sons) ------------------------------------------------------ http://www.miatacare.com http://www.cincimiata.com MiataMail.com list owner On Tue, Mar 27, 2012 at 2:59 PM, Helsel, Walt <[email protected]> wrote: Good, someone that knows what they are talking about. J (I haven't looked under the hood of a Miata in 11 months, and last time I did it had a half finished V8 in there. ) Wallyman From: Bill Cardell [mailto:[email protected]] Sent: Tuesday, March 27, 2012 2:55 PM To: Helsel, Walt Cc: fast G; [email protected] Subject: Re: Miata based Lotus 7 More likely it's an nb pulse damper, which is the same footprint. Bill Cardell Owner, Flyin' Miata Www.flyinmiata.com 1-800-FLY-MX5s 970-464-5600 On Mar 27, 2012, at 12:13 PM, "Helsel, Walt" <[email protected]> wrote: Your "surge unit" in photo 3 sure looks like a stock Miata Fuel Pressure Regulator to me. Wallyman From: [email protected] [mailto:[email protected]] On Behalf Of fast G Sent: Tuesday, March 27, 2012 1:16 PM To: [email protected] Subject: Miata based Lotus 7 I am hoping you guys can help me because I am really confused. I have a Miata powered Locost 7 based on a 2002 1.8 Miata (return less injection). The car has a hot start issue, it runs well, if I switch it off it re-starts fine. If I switch it all and wait 5 mins it will not restart until it cools down, say 20 mins. I got the car built so I do not understand why the fuel system is plumbed the way it is. But to me it looks totally wrong. To me it looks like the feed line goes to the fuel surge unit, the return line goes to the evaporator canister, and the vent line is just vented to the atmosphere. I am not sure I have a fuel pressure regulator at all. The first picture is of the tank http://s562.photobucket.com/albums/ss63/fastgxc/?action=view <http://s562.photobucket.com/albums/ss63/fastgxc/?action=view¤t=2012-0 3-24115835.jpg> ¤t=2012-03-24115835.jpg The hose at 2 o'clock goes to the evaporation canister. 4 o'clock is the fuel feed. 9 o'clock in a vent line, just vented to atmosphere. Picture 2 is the evaporation canister were the 2 o'clock hose goes. http://s562.photobucket.com/albums/ss63/fastgxc/?action=view <http://s562.photobucket.com/albums/ss63/fastgxc/?action=view¤t=2012-0 3-24115905.jpg> ¤t=2012-03-24115905.jpg Picture 3 is the surge unit.were the 4 o'clock hose goes http://s562.photobucket.com/albums/ss63/fastgxc/?action=view <http://s562.photobucket.com/albums/ss63/fastgxc/?action=view¤t=2012-0 3-24115921.jpg> ¤t=2012-03-24115921.jpg So I am thinking that I don't actually have a fuel pressure regulator at all. I am looking for a plan of action to work all this out. What do you think? Graham This e-mail and any attachments contain URS Corporation confidential information that may be proprietary or privileged. 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