What symptoms lead up to fuel pump going out?
Aynbody upgrade to 190lph?
How much trouble to upgrade?

 

Electronic fuel pumps usually just die. Ocassionally they will give a warning of sorts, hard starting or poor performance under acceleration but for the most part if you don't hear it prime when you turn the key on, thats when you discover the problem. They have been known to fail in mid trip as well but in my recollection its a rare occurance. Not sure about the upgrade. I would think the stock pump is sufficient unless you are doing major engine mods and/or increasing injector size/flow volume.

 

Most fuel pumps I've had fail on me were on start up(ran fine before then just won't start), but the Bronco's a different story. My Bronco FP died a couple years ago with no warning, had plenty of gas in the tank(witch made it a pita) and acted just like it ran out of gas.

 

My truck died going down the road like I was out of gas 1/4 tank. Truck restarted and died again 1/2 mile down the road. Towed home.
No check engine light or codes.
Changed fuel filter (was restricted) and checked fuel pressure 40psi key on engine off, 32psi at idle, increases to 38psi when revved. I can hear fuel pump prime when key is turned on.
I did add fuel system cleaner with last fill up.
I'm just wondering if their are indicators for pump failure or is it all or nothing?
I am planning to upgrade to Gt40 intake and Mass air 30lb injectors thats why I was asking about pump upgrade.
thanks all


Hey Greystreak sorry about the fire . Your new bronco looks just like mine all Black with chrome glad you found another good lookin truck. .

 

93BigBlackBronco,

Thanks. Greystreak is still awaiting some removal of components that I want from her. But back to the topic. Have you considered a faulty fuel pressure regulator or vacuum line to it? Just another avenue you might persue.

 

93BigBlackBronco
Just for the hell of it, try tracing your fuel injector wires back to the harness plug. I had similar problems a while back and found (eventually) my harness plug melted to the air blower cross-over pipe way down at the back of the engine. That was after doing the fuel filter, pump, ignition module, complete new exhaust & it was still dying out. Once it cooled for a bit though, it always started and ran good as gold but died as soon as the plug got melting hot again. It was a weird thing but once I fixed the plug and zap strapped the harness to the firewall, it never happened again. That was 4 years ago.

 

I'll check the wiring tomorrow because you never know, the pressure regulator checked OK when i did fuel pressure test. Regulator is about a year old, thats why I have the fuel pressure test gauge.
thanks for the advice.

 

Two relays (Guess everyone already knows this) before the "high pressure" pump gets current. The ECM relay and the Fuel Pump relay. Both of mine were under the hood, drivers side, just forward of the firewall. Cost around $7 each. Replace with HIGH quality relays, I'm told.
If they are both good, the high pressure pump will get current. I tested mine with a test light. The pump was just forward of the drivers seat, under the truck, attached to the frame, had two terminals (pos and neg). It was getting power (after replacing the relays and ensuring that the "inertia switch" wasn't tripped) but making no noise and it was the culprit. The inertia switch should be just to the left of the brake pedal, push the button on top down if it's up.
Once that pump was replaced, 10 second crank and it started. Tried to drive down the street but experienced fuel surging (runs great then chokes out). Turns out (fuel gauge inop too) the OTHER pump in the tank was out too and causing the front pump to starve (and everything in the tank was melted too). Replaced ALL of that and voila, got my cool '87 Bronco EB back!
Hope this helps, it's all in other posts I've been reading for a month.

 

Ford has used two systems.
One uses a low preasure pump in the tank, and a high preasure pump on the frame.
The other has a single high preasure pump in the tank.

With the dual pump system, it is possible for the tank pump to go out and the frame pump to run by siphoning from the tank. In this situation you will have intermittent problems. Any time the high preasure pump elevates above the fuel in the tank, it will lose suction. May cause other problems as well.

Also, some of the dual pump systems have two fuel filters. One is an in-line style filter easily located near the high preasure pump. The other one is a canister style filter that is hidden behind a heat shield, on the frame, next to the transfer case. This is the system on an '86, I don't know about other years.

Most in-tank fuel pumps go out when you turn the engine off. They rely upon the fuel in the tank, and the circulating fuel to cool them off. Turn the engine off, the fuel stops circulating, the pump heats up and dies.

Running the tank down to near empty before refilling is bad for your pump.

As for upgrading to a higher volume pump: Do you need it? I don't think there is any benefit to a higher volume pump unless you've upgraded your engine significantly.

 

does anyone know which years had which pump setups?

 

92-96 had a single in tank pump. I dunno about other years

 

who knows if the 90 bronco had one pump in the tank or two pumps?

 

I Think The Single Pump System Started In 1991 I Have A E350 Van And It Doesn't Have The Frame Mounted Pump. My 1988 Ranger Pickup Did Have 2 Pumps.

 

My 90 bronco has only one pump

 

have any of u guys ever made a fuel pump swap in the gas tank? i wonder how hard it could be..