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GMC Jimmy Fuel System

93 messages,  Last post on Aug 17, 2009 at 8:23 AM

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#3 of 93 Re: 90 Jimmy fuel Promblen [repairdog] by gator14 Sep 29, 2006 (3:24 am)
Replying to: repairdog (Sep 29, 2006 2:27 am) yep cause if you hot wire the fuel pump and some one pours gas into the TBI it runs great. i figure this is the only thing left to change ( i hope).    gator 14 Replies to this message: repairdog (Sep 29, 2006 7:06 am)
#4 of 93 Re: 90 Jimmy fuel Promblen [gator14] by repairdog Sep 29, 2006 (7:06 am)
Replying to: gator14 (Sep 29, 2006 3:24 am) Not sure which motor 4.3 or 2.8 you have or if CPI or the older TBI with the fuel metered into the top of the "carb". Did you check the ECM (may be 2) and ENG fuses also? CPI needs higher pressure like 60psi to start while TBI is like 12psi.
#5 of 93 thanx by gator14 Oct 01, 2006 (7:01 pm)
Well we got it going. Turned out to be broaken wire from the key to the relay. We just jumped the relay and it works. Thank you all for the help..     Gator 14
#6 of 93 1995 jimmy wont start by dbouchard Oct 20, 2006 (6:14 pm)
replaced plugs wires cap rotor fuel pump, sending unit, and fuel pressure regulator it has 62 psi key on not running 55 psi when it starts but some times wont start unless you spray starting fluid in intake , gm dealer ran test on spider assembly and said al was good , what should i try next? can anybody help Replies to this message: repairdog (Oct 21, 2006 2:07 am)
#7 of 93 Re: 1995 jimmy wont start [dbouchard] by repairdog Oct 21, 2006 (2:07 am)
Replying to: dbouchard (Oct 20, 2006 6:14 pm) Could be sensor or electrical - any codes set the SES ever? I'd look at the electrical connectors, the crank sensor under the front of the engine by the bottom of the timing cover (tells ECM where timing is off the crank), all wiring/cables from the battery are clean and good (do not like low voltage), then other sensors (MAF, temp, O2 etc)but GM should have scanned the sensors and ECM, then a weak coil so plugs are firing but weak. Finally, when was the cap/rotor new and was it Delco and not a cheap aftermarket one - I fought one for several days that was under a year old and was arching in the plastic (can't see internal casting) so several plugs firing at once - changed and all well. Then also look at the vac lines for rot and replace 5/32 and 7/32" all that are bad. The cam sensor in the dist will not cause a no start only rough idle. Then the ign module in the dist fires the coil, but........Sorry, not a simple answer but again suprised GM didn't see anything. Haynes/Chiltons cover testing most of these with a simple multimeter.
#8 of 93 95 jimmy wont start by dbouchard Oct 21, 2006 (4:14 am)
replaced plugs, cap, rotor,good spark at coil and at plugs , no codes, starts up when you shoot it with starting fluid, and will stay running ,try to restart and also starts most of the time but when it dont have to reshoot with starting fluid maybee once a week
#9 of 93 97 Jimmy will not build fuel pressure by 97jimmy1 Jun 07, 2007 (7:45 pm)
#10 of 93 97 Jimmy will not build fuel pressure by 97jimmy1 Oct 14, 2006 (1:31 pm)
I have a 97 Jimmy that will not build fuel pressure. If you give it starting fluid it will start and run on the starting fluid but then die when you stop feeding it. No pressure at the rail. Other symptoms I have found are that the oil pressure gauge stopped working (Stuck on 20 PSI). The fuel gauge shows just under full and it only has about 1/4 tank. It will not come out of park. All these things worked fine until the fuel issue. I have changed the fuel filter and found that it was pretty well blocked off. I have read that there is a fuel pump run wire under the hood. Is this true? Where would I find it? Any other way to test the pump? I hate to drop the tank and change it out ($300.00) without knowing its bad. Especially since I have the other symptoms. What other types of fuel shutdown safety/security items are on this vehicle (IE. low oil pressure, inertia shutdown)? Replies to this message: repairdog (Oct 15, 2006 2:53 am) 97jimmy1 (Oct 15, 2006 12:16 pm) slim10 (Jun 07, 2007 7:45 pm) tech1help (Jan 02, 2007 10:16 pm)
#11 of 93 Re: 97 Jimmy will not build fuel pressure [97jimmy1] by repairdog Oct 15, 2006 (2:53 am)
Replying to: 97jimmy1 (Oct 14, 2006 1:31 pm) OK - checked Haynes again and the test wire is red and by the firewall and master cylinder. This bypasses the relay. Check the ECM Bat fuse that powers the relay and switch the fuel pump relay with another thats the same as a test. Also remember that the 97 only has a known ignition switch (actually a module with wiring in the column) failure and it effects most power on the vehicle as it runs thru there when the key is turned. Replies to this message: 97jimmy1 (Oct 15, 2006 12:16 pm) slim10 (Jun 07, 2007 7:45 pm)
#12 of 93 Re: 97 Jimmy will not build fuel pressure [repairdog] by 97jimmy1 Oct 15, 2006 (12:16 pm)
Replying to: repairdog (Oct 15, 2006 2:53 am) Powered the test wire and the pump works fine. Rotated the relays (the 3 in the glove box) and no change. Checked all of the standard fuses and they were fine. Is the ECM Bat fuse located in the regular fuse box by the drivers side door or some where else?

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