Fuel pump functioning properly?

[Kschep]

So I’m still troubleshooting my engine issues surrounding my carb and I’m thinking at this point maybe it’s not the damn carb ... Haynes says it’s more often actually a fuel pump issue ... how would I go about checking the functionality of my fuel pump (76 fj40 - OEM fuel pump) and if it is having a bearing on my rig not running properly (have to choke it to keep it on - all the time or else sputters dead). I know they discontinued rebuild kits but I’ve seen some online / u can find em.

 

[DougAustinTx]

Disconnect the fuel line at the carb and put the line into a coke bottle or something. Then get someone to crank the engine while you watch the output into the bottle. Fuel should come out in spurts and anything more than a dribble will probably be ok. If low or no fuel, check your in-line fuel filter. If that is good, then the problem may be in the fuel pick up screen inside the gas tank. If there is a crack in any rubber fuel lines between the tank and the pump, the fuel pump may not have enough suction to overcome the vacuum leak.

 

[brian]

A slightly better method is to verify what pressure it can make.
Over the years I've had pump diaphragms fail that still moved plenty of fuel when disconnected but couldn't make the required pressure.

I don't think it's your issue however.

 

[ToyotaMatt]

So I’m still troubleshooting my engine issues surrounding my carb and I’m thinking at this point maybe it’s not the damn carb ... Haynes says it’s more often actually a fuel pump issue ... how would I go about checking the functionality of my fuel pump (76 fj40 - OEM fuel pump) and if it is having a bearing on my rig not running properly (have to choke it to keep it on - all the time or else sputters dead). I know they discontinued rebuild kits but I’ve seen some online / u can find em.

do we have a fuel filter on this truck ?

i would verify this important , base line status .........

 

[BROKEROB1]

I just replaced my old fuel pump on my fj40 yesterday with a new OEM... don’t know if it was having issues or not but it was 40 years old so...

I also just ordered a couple of rebuild kits from Mike’s... they seem to have a good reputation for putting together good Aisin kits... check them out...

And thanks to @Stumpalama for the tip!

High Quality Toyota Carburetor Parts

www.carburetor-parts.com

 

[ATLTJ]

I just replaced my old fuel pump on my fj40 yesterday with a new OEM... don’t know if it was having issues or not but it was 40 years old so...

I also just ordered a couple of rebuild kits from Mike’s... they seem to have a good reputation for putting together good Aisin kits... check them out...

And thanks to @Stumpalama for the tip!

High Quality Toyota Carburetor Parts

www.carburetor-parts.com

Where did you order the pump from?

 

[BROKEROB1]

Bought mine on eBay from Thailand but lots of folks have had good experiences with CityRacer and they are a solid supporter of our LC community...

OEM Mechanical Fuel Pump and Gasket for 9/'77 and Earlier Land Cruiser FJ40

Toyota OEM Mechanical Fuel Pump for 12/'72 to 9/'77 Land Cruiser FJ40. OEM part # 23100-61011. OEM gasket is included.Also works for all prior years if the connector fitting from the old pump is transferred over. Note that this part # replaces the following part #s:23100-60061, 23100-60062...

www.cityracerllc.com

Where did you order the pump from?

 

[Kschep]

do we have a fuel filter on this truck ?

i would verify this important , base line status .........

duel fuel tanks - so multiple filters...they need replacement for sure ....

 

[ToyotaMatt]

duel fuel tanks - so multiple filters...they need replacement for sure ....

Well ......................

i would ABSOLUTY start there 100% !

easy low cost , ease your mind solution , there is a solid 51% chance ,

1 0r both are clogged ?

why u ask ?

because a rear dual after market tanks in older trucks tend to rust badly inside and cause issues like u describe in detail above


also , possible a original 1976 tank can be compromised too ?

if u replace both / ALL fuel filters , with the ones in my Below link , and you still have isssues , then at least you know for sure , its NOT a Fuel Supply problem , and can move on to step # 2 in your diagnoses etc ...........


i highly and always recommend TOYOTA's Largest capacity and largest filter media element Carburetor Fuel filter they offer ,

its also transparent so u can see any foreign matter inside as u run the engine ect collecting and then possibility then confirm a possible bad tank or tanks u may have ?


Please Explore the Link Below , and let me know if i can further help in any way !


kindly matt


click link here :

Genuine KYOSAN OEM TOYOTA MADE IN JAPAN Fuel Filter Fits : 2F Engine FJ40 FJ45 FJ55 FJ60 1/75-8/87 - VintageTEqParts.com

Genuine KYOSAN OEM TOYOTA MADE IN JAPAN Fuel Filter - FJ40 FJ45 FJ55 FJ60 - Fits : All 2F Engines 6/78...

vintageteqparts.com

 

[Kschep]

So under the truck there are 3 plastic ones like you show - lol wow - remember that picture I sent you...let me dig that up for you ... also there’s the stock metal one under the hood - thoughts? I’m thinking I want to order 3 - taking away a redundant one

 

[Kschep]

Under the car ...
PO obviously had 1 going to one tank and another 1 going to the AUX tank and then another between those and the main under the hood filter, which then goes to pump - hah! Wow fun to trace the thought process behind that...

 

[ToyotaMatt]

YOU CAN DO IT !

unless im missing somthing , you only need 1 filter per tank ...........

did my Post on the choke breaker issue from the emissions 1978 FSM , help solve that mystery ?

i also have a TERCEL 1985 FSM if u need diagrams on that aspect

let me know

im here to help in any way i can

kinldy matt

 

[Kschep]

Maybe a call is in order - let me know if your around today.

Ultimately yes, the carb choke breaker explanation made sense etc. but it didn’t shine any light on if the fact that the choke breaker line being disconnected from the power steering pump unit had any bearing on the engine not staying on without choke on halfway...it’s super close! Haha after carb rebuild it started doing incrementally better but then I noticed that line being disconnected so I was basically trying to discern if it had an influence...

In regards to filters - the reason for me saying 3 - 2 for tanks and 1 for engine bay where original metal one is ...

From picture I would be eliminating one - then replacing the other two plus one in engine compartment

 

[pb4ugo]

From your pics, the current filters at the tanks look older. Do you see any rusty debris in them? Maybe cut them open and spread out the filter material and check. If they dont have rust in them, I would probably remove them and just run the stk one in the engine compartment. Multiple filters are going to create resistance in fuel flow. Typically, if you need to choke the engine to keep it running is an indication of a vacuum leak.

 

[Kschep]

I hear you that’s why I’m trying to consolidate this to how it’s supposed to be with AUX tank

 

[Kschep]

Can some peeps with Dual Tanks let me know their set up underneath in regards to fuel filters....

 

[CaliFJ]

Sorry to hijack. Do the OEM fuel pumps make some kind of priming noise when you turn the key on but not turn over? I’m not hearing that buzzing noise and there is no fuel in carb window. ‘76 w/2F Aisin.

 

[samatulich]

Sorry to hijack. Do the OEM fuel pumps make some kind of priming noise when you turn the key on but not turn over? I’m not hearing that buzzing noise and there is no fuel in carb window. ‘76 w/2F Aisin.

No priming noise, OEM is mechanical. It will only pump when the engine is turning over or running.

 

[CaliFJ]

No priming noise, OEM is mechanical. It will only pump when the engine is turning over or running.

Ok. Thank you for the response!

 

[tls3601]

I think it is supposed to pump a half cup with 40 seconds of cranking. Maybe one cup, @pinhead may know or maybe @FJ40Jim may chime in.