1987 Ford Bronco II Can't get Fuel

[johndough]

I bought a 1987 Bronco II that was sitting for close to ten years. I replaced in tank pump, high pressure pump, fuel filter above high pressure pump, fuel pressure regulator, and bypassed the inertia switch. I cannot get fuel pressure. What can y'all recommend?? I'm close to just sending it to the local mechanic but I'd really rather save money and fix it on my own. Any suggestions at all?

 

[rusty ol ranger]

Is the intank pump pumping?

 

[johndough]

Is the intank pump pumping?

Sounds like it is.

 

[lil_Blue_Ford]

Check to make sure you don’t have any blown fuses and check the fuel pump relay under the hood. Make sure both pumps kick on for the priming cycle when you turn the key on. Check to make sure you’re getting 12v at the pumps if it’s not cycling. It is possible to get a bad pump out of the box too. It is a pain to do all of the testing, I’ve been down this road before.

 

[alwaysFlOoReD]

Ive had multple vehicles with bad conections at the high pressure pump. Check to make sure that the spade connectors arent loose.
They are inside a rubber boot right on the pump.

 

[gaz]

johndough,

First, does it have correct pressure on the fuel rail? If yes, does it maintain pressure overnight?

Since you have all those new pieces, hopefully tested, prior to installation and you have bypassed the inertia switch, is it an auto or manual transmission. Check the clutch position sensor on a manual or the neutral sensing sensor with an automatic.

The clutch position sensor can be bypassed to troubleshoot, I suspect the same can be accomplished with the neutral sensor.

 

[rusty ol ranger]

johndough,

First, does it have correct pressure on the fuel rail? If yes, does it maintain pressure overnight?

Since you have all those new pieces, hopefully tested, prior to installation and you have bypassed the inertia switch, is it an auto or manual transmission. Check the clutch position sensor on a manual or the neutral sensing sensor with an automatic.

The clutch position sensor can be bypassed to troubleshoot, I suspect the same can be accomplished with the neutral sensor.

The safety switches shouldnt keep it from obtaining fuel pressure.

If both pumps are running, nothings clogged, kinked or massivily leaking, there is no reason you shouldnt have pressure at the rail.

Im assuming you have actually checked for fuel pressure at the rail valve with a gauge right? Not just battleing a no start and assuming its fuel?

 

[johndough]

johndough,

First, does it have correct pressure on the fuel rail? If yes, does it maintain pressure overnight?

Since you have all those new pieces, hopefully tested, prior to installation and you have bypassed the inertia switch, is it an auto or manual transmission. Check the clutch position sensor on a manual or the neutral sensing sensor with an automatic.

The clutch position sensor can be bypassed to troubleshoot, I suspect the same can be accomplished with the neutral sensor.

0 psi pressure at fuel rail. and it’s a manual transmission. how do i check the clutch position sensor?

 

[johndough]

The safety switches shouldnt keep it from obtaining fuel pressure.

If both pumps are running, nothings clogged, kinked or massivily leaking, there is no reason you shouldnt have pressure at the rail.

Im assuming you have actually checked for fuel pressure at the rail valve with a gauge right? Not just battleing a no start and assuming its fuel?

yes your right. i’ve checked with a gauge at the fuel rail valve. 0psi.

 

[johndough]

Ive had multple vehicles with bad conections at the high pressure pump. Check to make sure that the spade connectors arent loose.
They are inside a rubber boot right on the pump.

those are all good, appreciate it though man.

 

[rusty ol ranger]

yes your right. i’ve checked with a gauge at the fuel rail valve. 0psi.

Follow the fuel line from the tank up the driverside frame rail, youll see a little black canister looking thing. Pull the line off that run back to the tank and turn the key on, see if fuel pumps out.

Some even had a filter in the canister, that could also be plugged

 

[lil_Blue_Ford]

Follow the fuel line from the tank up the driverside frame rail, youll see a little black canister looking thing. Pull the line off that run back to the tank and turn the key on, see if fuel pumps out.

Some even had a filter in the canister, that could also be plugged

Forgot about that. Yeah, my 88 has one of those between the fuel tank and the high pressure pump and the ”normal” fuel filter up between the high pressure pump and the engine.

if both pumps are kicking on and you have 0 psi at the rail, there’s either a major leak, major blockage, or a pump is failing to pump. If the pumps are not kicking on, you either have a bad pump or a wiring fault. I’ve always started with checking to see if I have 12v at the pump after verifying the fuses are good and swapping the fuel pump relay with a spare I keep on hand. Sometimes I jump the inertia switch. If there’s not 12v at the pumps at that point, there’s probably a bad fuseable link or broken wire somewhere.

 

[johndough]

Follow the fuel line from the tank up the driverside frame rail, youll see a little black canister looking thing. Pull the line off that run back to the tank and turn the key on, see if fuel pumps out.

Some even had a filter in the canister, that could also be plugged

will do. i’ve tried messing with that canister and i could never get the cap off of it, any tips on how to get the cap off?

 

[rusty ol ranger]

will do. i’ve tried messing with that canister and i could never get the cap off of it, any tips on how to get the cap off?

Pull it off the frame and a big pair of channel locks....or oil filter wrench if its not to hard to get apart. Be careful with it though.

The cap just spins off kinda like a oil filter

 

[johndough]

actually now that i’m thinking about it, that shouldn’t be my problem. i bypassed that canister so that can’t be part of my problem.