Hi Gents, over in the UK for another year and the trusty Bronco has been behaving for the past two years. But...Yesterday afternoon and today this afternoon I crank it to start and acts like it isn't getting any fuel, good crank no turn over. 2.9L 88 EFI motor. Bronco II manual. So pumped the gas once (I never had to do that to start it ever) and she started up. Like I mentioned same thing happend this afternoon (started fine this morning though..weird). Once it is started it runs without any issues, no hesitiation, perfect, no check engine light. Get home, shut it down starts right up. So what could be my issue? Could the fuel pump be getting ready to quit, why would it run so well once it is running? Thanks for any help as I will have to order parts from the US and wait for them to ship over, so if you have any ideas let me know.
Starting problem
- Thread starter alfie
- Start date
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andre
New member
cauld have a leaking gas line or fuel regulator prom
try this
put key on two time b 4 u start if it start
cauld have broken fuel line leak or bad fuel regulator
try this
put key on two time b 4 u start if it start
cauld have broken fuel line leak or bad fuel regulator
BroncoJoe19
Active member
With an EFI system, I don't think pumping the throttle makes any difference at all. With a carburetor, there is a reserve of fuel in the fuel bowl, and if one pumps (even once) the accellerator, he squirts a small amount of fuel into the throttle body.
WIth an EFI, that is not the case. I suspect that when you first start up, that your fuel pressure has leaked back, and dropped to zero, and that it takes a few seconds for the pressure to build back up. IF you turn the key on, listen for the fuel pump to stop, 2-3 seconds and then try to start - it will probably start.
IF you have a Haynes manual, and a fuel pressure test guage you may test several components of your fuel delivery system.
'88 Full Size Broncos (FSB) have two fuel pumps, a low pressure one inside the driveer side rail, and a high pressure one in the tank. In 1990 they changed to a single inside the tank unit. I assume that the B2 was similar in design to the FSB '88.
One of the tests is a static pressure test.
After one checks to see if he has the specified pressure with the key on (you have electric pumps BTW); one must check to see if it "holds" pressure after the key is turned off. It should remain within 5 psi of the specifications for one minute after the key is turned off.
IF it fails this test, there are a few things which may cause it to fail.
1. a Faulty fuel pressure regulator
2. leaking fuel injectors
3. a stuck-open fuel pump reverse check valve
Haynes lists methods of testing the above, but one needs the fuel pressure guage to do so.
WIth an EFI, that is not the case. I suspect that when you first start up, that your fuel pressure has leaked back, and dropped to zero, and that it takes a few seconds for the pressure to build back up. IF you turn the key on, listen for the fuel pump to stop, 2-3 seconds and then try to start - it will probably start.
IF you have a Haynes manual, and a fuel pressure test guage you may test several components of your fuel delivery system.
'88 Full Size Broncos (FSB) have two fuel pumps, a low pressure one inside the driveer side rail, and a high pressure one in the tank. In 1990 they changed to a single inside the tank unit. I assume that the B2 was similar in design to the FSB '88.
One of the tests is a static pressure test.
After one checks to see if he has the specified pressure with the key on (you have electric pumps BTW); one must check to see if it "holds" pressure after the key is turned off. It should remain within 5 psi of the specifications for one minute after the key is turned off.
IF it fails this test, there are a few things which may cause it to fail.
1. a Faulty fuel pressure regulator
2. leaking fuel injectors
3. a stuck-open fuel pump reverse check valve
Haynes lists methods of testing the above, but one needs the fuel pressure guage to do so.
