1990 Toyota 4x4 Fuel Pump Failed Again

vegasfj40

Hi again! I just posted a thread a couple of weeks ago about what to carry as spares on trips. The one thing that I wasnt sure about was if the fuel pump had ever been replaced. Well, This forenoon I was nigh 5 miles from home on the freeway and the truck started to lose power until information technology would barely run. I was lucky to be about an off ramp and coasted off of the pike. Then it would beginning and run intermittently and stall.

I got it towed home and was checking to run into if the fuel pump was getting ability. I jumped the T connector on the left fender apron near the other diagnostic plugs per the FSM merely no fuel pump noise. I removed the supply hose to the rail and no fuel pressure at all. I jumped the connector with the fuel hose removed and no fuel. I can hear a relay about the passenger side clicking when I leap the connector just no fuel. Does it sound like a fuel pump trouble? I did get a check engine light when this happened and the codes are 5 and 6. I think they were triggered considering the engine was in gear and running when it started cutting out?

pappy

The easiest place to bank check fuel force per unit area is at the common cold beginning injector with the connector shorted.

FSM says:

Fuse
Circuit opening relay
Fuel pump
Fuel filter
Fuel pressure regulator (probably not since it's at the end of the rail)

If y'all don't hear the pump and so you accept probably lost information technology.

vegasfj40

Thanks Pappy, I am going to replace it with a Denso as yous mentioned in my previous thread. I was checking availability of the CO relay and information technology looks like information technology is obsolete from Toyota. Know of any sources for that? Would like to get a spare. Would the CO relay be what I am hearing when I short the T connector?

The Eradicator

It could be the fuel pump or it could be electric. The virtually reliable way to diagnose is to check the voltage at the electrical connector for the fuel pump while cranking. In a 4runner it is easy to get to the fuel pump and the connector; just three screws to pull of a encompass. I accept never done it on a truck, merely I think that you either have to drib the tank or remove the bed. I've pulled the tank on a 4runner before and it only took about an hr (would take taken less time if the tank and sideslip weren't caved in). Once you take access to the electric connector for the fuel pump you just need to cheque the voltage while someone cranks the engine. If it is getting good voltage and then your pump is bad. If not then y'all accept an electrical problem.

I accept tried to listen to the fuel pump in my 4runner before and it was silent fifty-fifty though it was working fine. Listening is a good indicator, merely silence doesn't e'er mean that the pump is bad.

The code 5 (lean condition) was more than than likely caused by fuel starvation. Same thing happened to me when my fuel arrangement was gradually clogged with rust. I'1000 non sure most the code 6. I've never had one, then I have never researched it. I doubt it would stop your fuel pump from running though.

You can probably get a excursion opening relay from here if you can't find one locally: Habitation - Jims Used Toyota Truck Parts

If you decide to supplant the pump, don't forget to buy the prophylactic gasket that goes between it and the tank. Information technology is only a few bucks and virtually dealerships have them in stock.

vegasfj40

I was able to do some more than checking today on my fuel pump result. I shorted the fuel pump diagnostic connector and checked for voltage at the pump and had 12 volts. And so the pump is bad. I got all of the gas tuckered and will lower it downward tomorrow. Volition I accept whatever issues with the supply and return lines lowering the tank as far as plenty slack? Anyone know if a CO relay from another truck would work? Plenty of early 90s 4runners in our wrecking yards.

pappy

That relay was used in a bunch of Toyotas. Get to napaonline.com, search for the part, and then in that location should be a button that will have you to a folio of other vehicles that as well use the same part.

pappy

At the computer. Here ya go:

Lexus ES 250 1990 - 1991
Toyota 4Runner 1985 - 1988
Toyota Camry 1983 - 1991
Toyota Celica 1986 - 1991
Toyota Celica Supra 1983 - 1985
Toyota Corolla 1985 - 1991
Toyota Cressida 1980 - 1982
Toyota Cressida 1985 - 1989
Toyota Country Cruiser 1988 - 1995
Toyota MR2 1991 - 1989
Toyota MR2 1991 - 1995
Toyota Pickup 1984 - 1988
Toyota Previa 1994 - 1993
Toyota Supra 1986 - 1992
Toyota Van 1984 - 1989

For education, the push button is "buyers guide" on the NAPAonline.com website. Merely brand certain you select your vehicle start. If you have ability to the pump with the test connector shorted the problem will non be this relay.

vegasfj40

Thanks over again Pappy! Only finished with replacing the fuel pump on my truck. She runs neat once more! I bought a Denso pump from Densoproducts.com. What a blessing that was that the pump went out when it did. I was planning on a piddling outing 2 days afterwards it went out. Sure glad information technology decided to crap out when it did! The only problem I had was disconnecting the supply line from the pump. I am pretty sure it had never been apart before.

pappy

The but problem I had was disconnecting the supply line from the pump. I am pretty sure information technology had never been autonomously before.

Certain hope you used flare nut wrenches. They do make life easier.

Jones Sucim1941

1990 Toyota 4x4 Fuel Pump Failed Again

85 Pickup 22RE Fuel pump upshot maybe (i Viewer)

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