schaff

I have a 1991 Toyota pickup 4wd with 22RE motor. I blew a gas line on the fuel pump hanger 4 months ago and finally got enough money to buy a new one. So truck has just been sitting for 4 months. I installed the new hanger and when I turn ignition switch to on I didn't hear fuel pump run. So I test lighted the power at the pump and the light came on which to me meant I had power to the pump so it must be a bad pump. Bought a new pump and got that installed and when I turned ignition to on pump still didn't run. Did some searching on the internet and saw many post about Fp to B+ jumper so I tried that and yay the pump started to run. I let the pump run for about a minute and it didn't shout off so I thought that was unusual so I turned ignition off. I turned ignition on again and started to crank engine but truck wouldn't start. Tried cranking truck a few more times but still nothing. I disconnected the union on my gas line to see if pump was pushing any fuel and it is not. Thought maybe I ruined my new pump so I installed old pump and still getting no fuel. Hopefully someone can help me get my yota running again because I really miss it?

scope103

The pump does NOT run with just key-on. It requires key to STArt. This closes the circuit opening relay, which powers the pump. Once the engine starts sucking air, a switch in the VAF closes, which holds the COR closed when you release the key, keeping the fuel pump running. Jumpering FP to B+ bypasses the COR and supplies power to the fuel pump directly with key on. You know all of this, as about 100 yotatech members have explained this when jumpering is mentioned.

Your time sequence is confusing. When you disconnected the fuel line, was the pump running (either by jumpering or cranking)? Without the pump running, you should have some residual pressure in the fuel line, but that dissipates in about 5 minutes. Unless you have a leaky injector, weak check valve, etc.

Did you leave the jumper in when you turned the key to start? If not, and the fuel pump didn't start with key to STArt, that points to a bad COR.

schaff

Pump was running with the key to "start" and while cranking but no fuel being pushed out open fuel line. Yes I left the jumper on when I turned the key to "start" and while I was cranking. I agree I think I have a bad COR but can't figure out why pump is not pushing fuel out open fuel line when key is turned to "start" and while I cranked.

scope103

Don't bother with cranking; if you think you can hear the pump running with the jumper, that's where you start.

Since you have the 22re, your fuel filter is easily accessible. I'd disconnect the feed to the filter and blip with the jumper (be VERY careful; gasoline and sparks mix VERY well). If you don't get splashed, you have a bad pump (not too likely to have two of them) or a blocked fuel line. If you do get a splash, replace the filter.

The COR is expensive; I wouldn't replace it on a whim.

schaff

Scope103-Thanks I'll try that tomorrow. The pump is definitely running with the jumper. What is the difference between disconnecting at fuel filter or where fuel pump hanger connects to fuel line? That was my thought too was not likely 2 bad pumps.

wallytoo

iTrader: (1)

are you certain that you checked output on the pressure line at the pump hanger?

the return and vapor recovery lines are easy to disconnect, but the fuel line is more involved.

schaff

Yes I I checked output on supply line see pic

wallytoo

iTrader: (1)

if the pump runs, but no fuel comes out there, either the line is blocked, the tank is empty, or the pump isn't working even though it runs.

schaff

wallytoo do you mean the line on the hanger is blocked? If so I blew air through that and there is no blockage in that. Tank is full of gas. So you think both pumps are bad?

osv

i think that there is a filter sock on the fuel pump pickup? those things get clogged, not sure if it's enough to fully block the fuel flow.

it probably comes out with the fuel pump, tho, right? so you've already checked it.

wallytoo

iTrader: (1)

the sock is attached to the pump pickup, so it had to either be replaced, or it is missing, or reuse the old one. seems that if it was clogged, it would be noticeable.

wallytoo

iTrader: (1)

anything is possible. could be the line from the top of the tank to that fitting, if the hard line from the pump to the top of the hanger is clear. if the pump motor is operating (with the jumpered pinouts), and no fuel is coming out of the hard line, (and the tank is full), there is either a blockage or the pump doesn't pump.

schaff

Brand new fuel pump and fuel strainer. Hard line on hanger is definitely not blocked. I removed pump and blew air through it to verify that.

boobiebuzzard

Check to see if your wiring on the pump is correct polarity. It the polarity is crossed it will still run just backwards.

schaff

Pump is wired as follow-Blue wire goes to positive side and black wire goes to negative side. I can try to switch them and see if I get any pressure.

wallytoo

iTrader: (1)

pump won't run backwards.

schaff

Ok I won't try that.

schaff

Got my truck running. Someone siphoned all the gas out of my tank. I had put 18 gallons of gas in the tank the day before I blew the line. It's amazing how well it runs with gas. Thanks for all the replys!

scope103

Whoo-hoo!

schaff

Scope103-LOL!!! Never imagined it was out of gas. i can't tell you how many times I had that pump hanger off and never looked into the tank until tonight. I live in a very rural area where everybody knows everybody. Never expected someone would steal my gas.