Question about 1989 Ford Bronco II

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What is the fuel pressure to the fuel injectors from the pump?

I don't want to have to take off the gas tank, the truck is pretty rotted, and I want to put in an in line fuel pump, I am only using it as a plow vehicle, and just wondering what psi pump i will need.

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The engine uses about 30 PSI, under normal conditions. Most OEM pumps are higher, and the fuel pressure regulator sends the excess pressure back. Usually, anything above 45 should work..

Posted on Dec 08, 2008

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How does the fuel injectors fill up with gas?


Under pressure from the fuel pump. The gas goes from the tank to the pump, to the injectors and excess is returned to the tank. The pressure must be constant and to a minimum pressure.

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My GMC Sierra ran out of gas and now I can't get it to stay running.


Fuel injectors require a high pressure fuel pump which is located in the gas tank. The gas serves as the lubricant for the pump, so wen you ran out and emptied the tank completely you no longer had lubricant and the pump burn out. It won't pump gas now because it's the fuel pump is burned out and needs replacing. It runs when you put fuel in the injectors as that bypasses the pump. Replace the pump and the never let the tank get below 1/8th full (half a 1/4 of a tank).Not lie the old low pressure fuel pumps on the side of the engine blocks. Not cheap to buy a fuel pump and have to drop the tank to replace the burned out one. $$$ in costs even it you do it yourself.

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Where does the fuel line at the end of the injector rail run to on a 1991 rodeo


All fuel injected systems have a feed line to the engine's fuel rail to keep constant pressure at the injectors fuel entry point. A tiny bit goes into the engine cylinders when the computer allows the injector to open by a signal pulse.
And the rest of the fuel in the rail is pushed by the pump back to the gas tank by a Fuel Return Line (what you are seeing and the other line in all fuel injected systems.
Think about it. The pump is running constantly (with the engine), so to avoid pressure build-up, or having to continually turn the pump on and off, voila, put in a return line after a pressure regulator gets the pressure right in the rail, and let the excess go back to the tank. Pretty good idea: no stale gas left there on top of engine. I hope this helps you understand it better.

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Don't have a diagram, but maybe I can help. Do you see the injectors? They are held on by o-rings to the "fuel rail". On a v-6, there would be two fuel rails connected together with piping. The line from your tank goes right into this fuel rail, and with the pump, keeps a steady pressure up to feed the injectors. On one end of the fuel rail is a small circular object with a vacuum line. That is your pressure regulator. It keeps the pressure constant, and the excess fuel goes out the regulator and into your fuel return line, back into the gas tank. The fuel rail would be on top of the intake manifold, bolted down. Hope this helps.

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Motor turns over won't start. Cleaned terminals, put in new battery, still won't start. Removed gas cap to vent air on hot day, still won't start. Lights all come on, all electrics appear to...


Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they get loud or stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.

It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.

If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.

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I have a 99 mercury mountaineer and it ran out of gas after I put gas in it its like the truck just won't kick thegears ovr do u think I need a new fuel filter or a whole fuel tank


Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they just stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?

You dont need another fuel tank. Running a vehicle out of gas allows any trash or goo to get in the fuel system. Trash mostly is trapped at the pump inlet screen and in the filter. GOO can make its way into the injectors. Throw in a bottle of injector cleaner. A sure indication of a bad fuel pump is an audible constant change in rpm's. It sounds like it's changing gears.

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I have a 1988 ford bronco xlt and it wont start.I have replaced the 2 pumps and now they operate nicely.I get pressure out of the schraeder valve on fuel rail.I also have power at all injectors upon...


It could clog injectors and mess with regulator. I would start by replacing fuel filter and regulator and see if it fires up then. Do this and let me know.

May 12, 2011 | 1988 Ford Bronco II

2 Answers

FUEL INJECTORS WON'T LET FUEL PUMP OUT


Check your fuel filter and see if fuel is getting through it. You will know whether to look forwards or backwards after looking at the filter.

If you have the switchable gas tanks check the switch. Usually one side will always work, but if it came apart inside it may block the lines.

Since you have pumps at the tanks you should be pushing fuel, not like a diesel that pulls fuel. I would say a TPS (throttle position sensor) could be bad as it tells the injectors to let the gas in, but you say the injectors are dry. When you test, block the TPS open a bit or test for fuel before the injector rail.

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This injector set-up needs a specific fuel pressure supplied to the fuel rail to even start, much less run properly. The fuel pump is immersed in fuel inside the gas tank to keep it cool and not burn up. Running the fuel level low causes more heat in the pump and interuptions in proper fuel pressure. AC/Delco pumps have proven to be a reliable fix, the aftermarket pumps only last for a month or two sometimes. Check fuel pressure under the hood and power and ground to fuel pump at electrical harness at top of gas tank. This truck needs a fuel pump.

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