1994 Chev S-10 Blazer Stalling - Fuel System

Question: My S-10 blazer 4.3 seems to go into a vapor lock situation after it is warmed up. The fuel pressure drops off after it gets hot, only when the outside temp is over 80. I have replaced the fuel pump twice, the pulsator valve on the sending unit, the fuel filter, and the CFI (central fuel injection unit) and it still stalls and is hard to start when hot. it runs fine when the outside temp is cooler.Also specs call for 54-64psi, and after i replaced all the parts mentioned above, when i tested the fuel psi, (engine stone cold), the reading was 53 psi.It will run fine at that psi but when it gets hot the psi starts dropping off untill it reaches about 45 psi then it will stall out. ANY help would be appreaciated

Here's How To Get Guaranteed Solutions In Minutes

Technican: Sounds like you have done all the hard stuff now ... unfortunately we have to take a shot at a few things. Have you attempted to run the engine with the gas cap either off or loose? This may cause a heavy vapor (gas) smell by the gas cap ... you could have a gas cap that is not regulating the tank pressure / vaccum properly. If this does not work then you will need to check the 3rd hose that comes out of the top of the tank and make sure the hose is not clogged. Start with the cap and let me know.

Owner: Thanks for your time and effort Al. I replaced the cap and checked the 3rd line from the tank to the vapor canister and it still loses fuel pressure when the outside temp is above 85.I also replaced the t-stat just for the hell of it, but the psi still drops off when hot. I checked the fan clutch and it seems to be working like it should.When the weather is in the 70's it holds 60psi and will run forever.(i have a pressure gauge that reaches inside the vehicle so i can monitor it all the time) As best as i can tell, the pressure regulator is getting too hot and staying open and allowing the fuel to return to the tank before enough psi can be obtained to run the injector. The real bitch of this all is, that i am an ASE certified Master tech of 20 years and this is MY OWN vehicle, and it's kicking my ass! Any other thoughts would really be appreciated, thanks again . Larry (Denver CO.) p.s. I might have to wait until winter to drive this damn thing :)

Owner: Here is my last possible thought.. any possibility that the supply line is running close enough to a heat source that with the additional heat of the day you start to vapor lock in a line??? This is really bs... but try to run a new fuel line (copper or hose what ever you have) in a completely different way then the factory did.. or just see if you are missing a heat shield.. If that doesnt work .. I guess you have to go buy a ford.. Let me know.. I also have been turning wrench for 28 years and this is a good one...

Owner: It was the VAPOR Canister!!!!!!!!!! I pluged off the 2 vac. hoses, and disconnected the vapor hose from the canister, and let the hose vent towards the air cleaner asm. I am guessing that the canister is loaded up with fuel? The dealer wants $80 for the canister, what do you think about getting a used one? Thanks again for your effort Larry p.s. I'd rather push my chevy, than drive a Phord!! :)

Owner: yes a junk yard canister will work find...glad I could help

Here's How To Get Guaranteed Solutions In Minutes

Home

Chev Answers

APV
Astrovan
Belair
Beretta
Blazer
C 10 Pick up
Camaro
Camaro Convertible
Camaro IROC
Camaro SS
Camaro Z 28
Caprice Classic
Cavalier
Celebrity
Chevelle
Chevy Van
Corsica
Corvair
Corvette
Impala
Lumina
Malibu
Metro
Monte Carlo
Monte Carlo SS
Nova
Other Pick ups
S 10 Blazer
S 10 Pick up
Sedan
Silverado
Spectrum
Suburban
Tahoe
Tracker
Vans
Venture
Z24

Home

template

1994 Chev S-10 Blazer Stalling - Fuel System

More S-10 Blazer Answers

Home

Chev Answers

Home