GT-40 hard start

I think I'd run the boat as it is now on your vacation since you know it runs and does everything OK except maybe the idle issue might or might not be cured

Nice work once again Ken.  You are correct that family of Carter pumps use the same connector and they have that small + and -

Sure enough!!! There is a teeny + and - I had not seen before... thanks!!!

Ok, back on this... The idle with the fuel pressure regulator disconnected seemed improved... I ordered the regulator and both pumps anyway... Replaced the regulator... first key on gives 31 psi, second one (without starting) gives 41 psi... I suspect with these symptoms that I have BOTH a fuel pump and regulator issue. I will replace both of my 25 year old pumps. The one on the block (low pressure?) does not have a plug like the new replacement does. It appears to be just wired into the harness. There do not appear to be any markings on the new one for + or -.... Both wires on the new one are black... Old one had green/striper and black... How the heck do I wire this correctly?

.... sorry for the misstep putting this in another thread... I've never been accused of being the brightest bulb on the tree.,,,

... I'd say our 1997 GT-40 is at about 90-95% right now... crappy idle is fixed, hard start is fixed... really running pretty much new... Only remaining issue is that it's slightly harder to start than it used to be.. It's barely worth mentioning, really... But I think it cranks just a tiny, little bit more than it used to when new before it starts. I've had a fuel pressure gauge on it in the past and it always read withing spec, but I gotta wonder if the pair of 25 year old pumps with 1700 hours should just be replaced anyway......

IAC seems to have fixed the crappy idle... All is well now... thanks for all the help once again, guys!

wetskier2000 wrote: Evaluations of the new injectors may come in slowly... My wife broke her toe shoving it into her binding over the weekend... She's on injured reserve for a few weeks (... and less than happy about it)...

Early signs are positive... We'll see what the next couple of weeks brings...

The purple injectors are installed... I had to run the wires up over the fuel rails to accommodate the plug adapters, but no big deal (I hope). Before the wires were under the rails... Also should have listened to myself and used a little grease on the orings instead of the internet guy that used gasoline.. I tried using 93 Octane and it didn't work worth a crap... back to my method of a little grease and they slipped into the intake like a teenager into a cougar.

You can be about 101% confident 

Here is Nautique Parts listing- https://www.nautiqueparts.com/product/fuel-injector/   notice the price 223.55- that is each  

A quick search on NautiqueParts doesn't show injectors... Are they available?

Seemed to begin hard starting when the engine had been run and allowed to cool down for 15 minutes or so. I could start it by giving it considerable throttle. Now this has progressed to cold starts as well. Put in plugs, cap and rotor cuz they showed some wear/age. Didn't change it at all. Old plugs tell me fuel damp (not quite soaked) on the starboard side and 1 oil soaked on rearmost cylinder on the port side. Although, it's not really oil soaked on the portion in the cylinder, more on the exterior of the plug, but no obvious runny oil signs on the motor... Not sure how this is happening...