Replaced a fuel pump recently as part of resolving an idle fuel pressure issue. Diagnostic thread here:
Didn't find much documentation on this site so here's my attempt for future reference.
Couple strategies to do this. From above through the cabin access hatch, or below via dropping the tank. Having done this, dropping the tank is the way to go. Avoids cutting the body to enlarge the access hole. Then inevitable fight with the tight retention ring. Quicker and easier, albeit messier and working in a more uncomfortable position. Roughly a 2-4 hr operation, or 3 out of 5 banana job. Run fuel down ~0 mile range, leaving about 3-4 gallons to make dropping easier.
77169-02050 Fuel Pump Assembly o-ring ~$7
Options:
83320-60580 Fuel level Sender ~$140
77020-60342 Fuel Pump Assembly ~$451 (Recommend for incrementally more, just replace the whole assembly which includes fuel level sender which has been known to go out on occasion)
77144-04010 Fuel Pump Retainer Ring ~$42
P0171: System too Lean (Fuel Trim)
Working through this and could use the hive minds support. P0171: System too Lean (Fuel Trim). Also P0300: Random/mulitple Cylinder misfire detected. Multiple specific cylinder misfires P030x. Symptoms: In diagnostics after getting home. LT fuel trim on both banks at idle are high. +15 and...
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Didn't find much documentation on this site so here's my attempt for future reference.
Couple strategies to do this. From above through the cabin access hatch, or below via dropping the tank. Having done this, dropping the tank is the way to go. Avoids cutting the body to enlarge the access hole. Then inevitable fight with the tight retention ring. Quicker and easier, albeit messier and working in a more uncomfortable position. Roughly a 2-4 hr operation, or 3 out of 5 banana job. Run fuel down ~0 mile range, leaving about 3-4 gallons to make dropping easier.
Parts (please check for year compatibility)
23220-50271 Fuel Pump ~$29077169-02050 Fuel Pump Assembly o-ring ~$7
Options:
83320-60580 Fuel level Sender ~$140
77020-60342 Fuel Pump Assembly ~$451 (Recommend for incrementally more, just replace the whole assembly which includes fuel level sender which has been known to go out on occasion)
77144-04010 Fuel Pump Retainer Ring ~$42
References:
Tools:
- Tall jack stands (6-ton)
- 12 and 14mm socket
- Fuel pump lid/ring removal tool. Or hammer and dull chisel/metal bar
- Shop vac or air compressor
- Floor jack
Steps:
- Discharge fuel pressure
- Remove C/OPN Relay in engine bay relay block
- Crank over engine to bleed off pressure
- Remove Fuel Tank skid
- 5x 14mm bolts
- Prepare Fuel Tank for Removal (reference video)
- Remove 2x forward lines: fuel pump feed and return line alongside tank. Held together by plastic retainers that pops out easily by hand or gentle pressure with a flat blade
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- Remove 3x rearward lines: large diameter tank fill (10mm hose clamp), fill breather (pop up brown retainer, and squeeze side button fuel connector) , evap canister breather (pop up green clip). Remove from body retainers
- Drop tank - supported by floor jack, transmission jack, or the like. Not very heavy, but needs to be supported to control drop to undo fuel tank harness
- Remove two straps. 2x 12mm bolts. Remove retaining clip and pin. Remove straps
- Drop tank ~10". Reach up and around tank, right behind trailer arm link on frame, to unclip harness (reference video)
- Drop tank completely out. Guide rearward lines.
- Clean top of fuel tank before opening pump assembly. Recommend a shop vac with brush head
- Remove 2x lines from pump assembly cover. Cover ports.
- Open pump assembly
- Mark retaining ring position. (You'll need to tighten back or almost back to this position)
- Use fancy ring removal tool. Or old school hammer to gently tap tap, reposition 180* tap tap, repeat. Gentle taps and potentially hundreds of taps so as not to break ring. It'll only give a mm at a time, and need to turn ~180 degrees for it to loosen up enough to turn. Don't count on it turning full circles with any tap. Patience.
- Note 4 safety catches that needs to be depressed when opening
- Solve jigsaw puzzle to disassemble housing.
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