1991 Ford Bronco Bronco problem part 2 please help

Tiny
JEREMY87
  • MEMBER
  • 1991 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
It turns out it was a fuel pump.I replaced the fuel pump fuel filter fuel lines spark plugs distributor distributor rotor. Now it is having problems starting and it runs bad unless I use starting fluid then after it runs on starting fluid for a little while it will eventually run.I cant figure out for the life of me why it is having so much problems starting. Any ideas
The fuel pump is pumping you can hear the pump kicking on.
Do you
have the same problem?
Yes
No
Sunday, December 14th, 2008 AT 11:21 PM

1 Reply

Tiny
DAVE H
  • EXPERT
You need to check fuel pressure and fuel pressure regulator?

FUEL PRESSURE REGULATOR
The fuel pressure regulator is attached to fuel supply manifold assembly, downstream of fuel injectors. It regulates fuel pressure supplied to injectors. Regulator is a diaphragm-operated valve with one side responding to fuel pressure and the other side to intake manifold vacuum.
When intake manifold vacuum is low, an internal spring increases pressure on diaphragm, blocking off fuel return passage and increasing fuel pressure. When manifold pressure is high, spring pressure is overcome by vacuum, opening fuel return passage and lowering fuel pressure. Excess fuel is by-passed through regulator and returned to fuel tank.
The regulator also controls fuel line vapor formation, allowing for rapid restarts, assistance in engine idle stabilization and maintenance of fuel pressure when engine is turned off. Pressure is adjusted at factory to compensate for fuel flow differences between injectors.

1991 FUEL PRESSURE SPECIFICATIONS (EEC-IV - TRUCKS)
Engine. KOER psi (kg/cm2 ). KOEO psi (kg/cm2 )
4.9L EFI.45-60 (3.2-4.2).50-60 (3.5-4.2)
All Others.30-45 (2.1-3.2).35-45 (2.5-3.2)
Was this
answer
helpful?
Yes
No
Monday, December 15th, 2008 AT 5:36 AM

Please login or register to post a reply.

Recommended Guides