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Anyone know a source for the small o-ring retainer on the fuel pump? I just put in a new pump and the top white plastic part split and it leaks fuel enough to a point it isn't really driveable. The LTFT and STFT is 20+ (lean)..... Bad....
I see Denso pumps are about the only that comes with them new, maybe Delphi, but no one else shows it. Its a problem.... And I don't know how to solve till I find it, or hate to say, buy a Denso fuel pump that has it....
This isn't a GS pump but the same parts. See the circled items? Those... I found this on a Mitsubishi forum. This particular pump looks like a Turbo Supra pump. Same parts I need though....
NOTE: anyone replacing a fuel pump, ensure you get a DENSO pump that comes WITH these rare parts. You cannot buy them without a pump. Only Denso and Delphi have them.
Off to raid the beautiful red SC400 in the boneyard to pull its pump to see if I can keep it intact. Sad to see a Lexus in the boneyard.... Only had some repairable pass door damage. Else in great shape.
Some tidbits for those who are weird and try to figure out what goes on what:
Fuel Pump (According to LexusPartsNow.com)
Denso aftermarket lists the 951-0003 for all RWD (car) applications 23221-46120 for 98-00 GS300/GS400 23221-50090 for 01-05 GS430 23221-70360 for 01-05 GS300
Denso aftermarket lists the 951-0002 for most Lexus FWD applications
23221-20030 for 1999-2003 RX300
23221-74090 for 1999-2003 RX300
Fuel Pressure Regulator (According to LexusPartsNow.com) 23020-46030 for 01-05 GS430 (Cross references to Beck Arnley 158-1528) 50 PSI 23020-46040 for 01-05 GS300 (Cross references to Beck Arnley 158-1173) 43.5 PSI
23020-46020 for 98-00 GS300/GS400 (GS400 Cross Reference to 158-1158 and GS300 Cross References to 158-1173) 50 PSI
Looking at the photos of these, the 01-up regulators have a minor difference. I do believe these are both interchangeable.
23020-70010 for 01-03 RX300/01-04 Highlander (Cross references to Beck Arnley 158-1159) 44 psi
I put a Beck/Arnley fuel pressure regulator on my GS400, a 158-1158 and it shows a 158-1173 for the 98-00 GS300 and the 158-1158 for the GS400. But yet Lexus lists the same 23020-46020 for the GS300 and GS400 in 98-00.
Anyone know a source for the small o-ring retainer on the fuel pump? I just put in a new pump and the top white plastic part split and it leaks fuel
you didn't even look did you?
you will have to do some reading, I don't recall if OCH said where he got it but gives the size in post # 50, It seems the 98-2000's have this issue but I don't recall anyone with a 2001+ having that problem so maybe just switch to the newer assembly
No help in that thread, I looked. Has no information about the small while plastic piece I needed.
So what I decided to do was to double stack 2 o-rings and carefully press them into the filter (took a lot of effort). It is sealed perfectly now and I don't need the small plastic retainer on the end of the fuel pump outlet now. Problem solved.
No help in that thread, I looked. Has no information about the small while plastic piece I needed.
So what I decided to do was to double stack 2 o-rings and carefully press them into the filter (took a lot of effort). It is sealed perfectly now and I don't need the small plastic retainer on the end of the fuel pump outlet now. Problem solved.
you could always check with OCH he is very familiar to this so he might have some more incite but if its working, than its working
I did some playing around. Tried a 01-05 fuel filter on my 98 GS. No go. Very very close, but no go.
The plastic filter doesn't latch up properly to the base of the 98-00 GS mount. Everything else is fine, but the size is about 1mm wider than the 98-00, so it won't latch properly.
If anyone wants a new 01-05 GS fuel filter with a tab broken on the fuel pressure regulator jet clip, its free for the taking. I bought one and someone at work was looking at it and dropped it and broke the tab. It should be ok, but it won't hold the fuel pressure regulator jet in completely.
You can easily swap to a 01-05 but you need the whole top assy. Don't see any real advantages other than one of the fuel holes on the filter seem slightly larger on the 01-05 than the 98-00.
So my fuel trims I noticed starting climbing higher and higher till it got to the positive 20's. and I started getting misfires on bank one. but only when first started in the morning. wouldn't do it when hot or coming out from the store. anyways, thought it was a good time to upgrade my fuel pump to a higher flowing higher pressure pump. so with new walbro turbine pump in hand, new fuel filter, jet pump, fuel pump sock, all from the dealer. I set out to do the install. wanting to find out exactly what was causing my issues I paid close attention to everything as I dismantled it. sure enough, the little round white plastic piece that sits at the very top of the fuel pump was split. that would have been the cause of the fuel pressure bleeding off. so I would up buying some viton fuel safe orings and did the same thing. doubled up the original fuel pump outlet o ring and than installed the slightly smaller o ring on top of that then shoved it up into the filter. Im not really okay with the ghetto fix. especially since I can't confirm that %100 of the available fuel is making it up into the fuel rails. Might wind up doing what it takes to get ahold of all the pieces that should of been installed with the new pump.
I had to buy a new Denso fuel pump to get the little white piece. My doubled up o-rings seemed to work, but after about 600-1000 miles it started acting up like a bad fuel pump again (STFT 20+, LTFT 20+), cold start but barely driveable, and was progressing to a point where it was barely driveable in short order. Every cold start it got worse.
So I put in my new Denso pump today, the AirTex pump is going back. What the problem is, I can't tell. My fuel filter was awful, I replaced it too. Anyone going in for a pump just change the filter while you are at it, its only $20 at Amazon.
If you don't have a REASON to go with a higher VOLUME pump (guessing that is what you want), pressure is meaningless, the fuel pressure regulator handles that anyway (50 psi), so going higher pressure doesn't do anything. If it is isn't a modded engine while it can use the higher volume, it doesn't help anything, and could cause low speed driveability issues. The 10% ethanol gas is our enemy here, the ethanol is mildly corrosive to plain rubber, I have problem with politicians playing chemist with my cars fuel system.
well well well... looks like we both jumped on the denso made in japan quality train. need less to say, my car loves the new denso pump. long story short. it actually flows better than the aftermarket walbro I was running for a short time.
Well, the whole reason I had these driveability problems that triggered me to do a fuel pump came back, yet again....
This now with fuel pump #2 (so FP#1 is likely good). LTFT and STFT were 20+. I was datalogging it trying to diagnose it, seeing super lean trims, and I pulled the door off under the rear seat and banged on the pump and voila the trims straightened out and the car started to idle perfectly. Half way to work the LTFT and STFT were averaging 0, a tad rich, but the mean fuel ratio was spot on. So I stopped and started back up after a brief stop and one side (bank 2) was lean (20+ LTFT) at idle, and Bank 1 was fine. I had to go so I drove with it till my laptop died, but the trims off idle were mixed good then bad then good then bad.
So must be a bad connection somewhere (rusty ground?), but the fuel pump doesn't use the tank for any ground that I can see.
Anyone see this strange behavior? I'll be under the car this weekend to figure it out, but in the mean time I'll probably run a make shift ground wire to the tank and see what happens.
when you went to remove the fuel pump from the hanger assembly, you would of noticed that on the bottom side of the fuel hat, where the wires pass thru to the bottom side connectors, you would have seen three different black wires that branched together (grounds). Than they would have gone to the negative lead on the fuel pump. BUT... you probably didn't cut any wires right? Since you bought a plug and play fuel pump. so likely those wires are still ok. you mentioned that you hit the fuel tank and it trimmed out. maybe coincidence, maybe not. if thats the case, than pull that pump module back out and make sure all the wires are intact. spray some brake cleaner around the engine while watching fuel trims and see what happens.
02-06-17, 08:10 PM
o-ring retainer on fuel pump?
