Question about 1998 GMC Envoy
I.m trying to disconnect the feed and return fuel lines going into the spider injection system inside the plenum. I know the fuel line coming from underneath the truck has a built in 5/8" nut but the connecting nut infront of the bracket the feed and return lines connect to, I don't know what size they are. I know they are bigger than 17 mm open end wrench I have. I'm trying to disconnect this connection to see if there is a forgien blockage since ther is no fuel at the strator valve but when I cycle the key you not only hear the fuel pump run but there is fuel before and after the fuel filter. any info on the connecting nut's size would be helpful since I couldn't find anything about that in the haynes repair manual.
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Posted on Jan 02, 2017
SOURCE: Flare nut wrench size?
try metric size. a flare wrench is an closed end wrench with a little **** in big enough to to slide over the line and then around the bolt its grabs mor of the bolt than a regular wrench
Posted on Dec 13, 2008
On a NO Power to FUEL Pump Problem One Must ALWAYS Start from the Begining of the THAT CURCIUT, This Being the Fuse , Then The FUEL PUMP Relay , And Then WIRING , and LAST Is The PUMP Itself. Here is Info on the RELAY. rejakwilsoin @ aol.com < is my Email Address if you want More info Feel free to Contact me.
The Fuel Pump Relay is located in Underhood Fuse Relay Center. The Underhood Fuse Relay Center is located on the LH rear of engine compartment, on fender.
REMOVE OR DISCONNECT
Posted on Nov 02, 2009
Testimonial: "HE WENT ABOVE AND BEYOND WHAT WAS ASKED AND HE GAVE GREAT ADVISE ON THE PROBLEM I HAD "
SOURCE: 6.2 diesel will not bleed diesel
Make sure all lines are light when turning engine over.While turning engine over loosen the a line closes to pump or the fuel filter.You should get some fuel.Then continue on all lines working farther away.
Posted on May 02, 2010
Tips for a great answer:
Mar 01, 2015 | 1995 GMC Jimmy
Jun 01, 2012 | 1998 GMC Sonoma
The fuel filter is serviced only as part of the left fuel level sensor assembly in the fuel tank
1. Remove rear seat bench
2. Fold carpet forwards
3. Fold back rubber mat
4. Remove the nuts and fold back metal cover
5. Disconnect electrical connector
6. Release and disconnect fuel feed and return lines
CAUTION: The fuel gauge must roughly indicate zero before the left tank opening is opened. Large quantities of fuel may emerge upon opening. If necessary, keep the left tank opening closed and feed an extraction hose through the right service opening to the left tank half and drain the fuel out of the left tank area before proceeding.
7. Release the screw cap
8. Carefully raise fuel level sensor until sensor flange emerges.
CAUTION: Risk of breakage! When raising sensor unit, do not pull excessively on connecting piece of fuel return line.
9. Disconnect line to fuel filter
10. Disconnect suction jet pump from fuel filter (Press catch downwards to detatch suction jet pump)
11. Remove left sensor unit from the tank.
12. Reverse order to install
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