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I have a 1988 Custom Bronco - 4.9L 6cyl w/ manual 5spd. First year Ford came out with Fuel Injection.
I have had at 2X truck shops and they can not duplicate the issue. So yesterday, it was ~85 degrees and I am coming back from town (30miles) and it just loses power, like it has a vapor lock. The engine died along side highway, I opened the hood and was waiting for it to cool off and I am only ~7miles from home.
A motorcycle stopped, said he was a mechanic that just got off work and was heading home. He said he owned an 88 Bronco in the past. Said it sounded like the Fuel Pump - [it was just replaced about 200miles ago]. He said he would crawl under and for me to turn the key off, then try to start it........I guess he could feel it "kick on / vibrate"......so he said it was working, but the connections were probably "Old" - he could feel connection "crack" when he pushed on it and should be replaced - (why didn't shop put new $5 connectors on when they replaced the fuel pump). Any way he mentioned there is a 2nd fuel pump in the fuel tank and it is probably weak or going out. He recommended also Replacing that pump as well.
Any other suggestions?????? or Recommendations????
My new pump lasted 36 miles, check pressure, how old is FPR, (fuel pressure regulator), check for codes, even if check engine isnt on, can have stored codes.
Your in tank low pressure fuel pump feeds fuel into the reservoir that supplies fuel for the high pressure frame pump
When they get old
Those reservoirs get to where they no longer flow fuel
I would do some of the testing in a 1988 or 1989 PCED about electric fuel delivery systems
One quick test is a fuel volume test from the rear tank pump coming through the reservoir
I'll post some of that diagnosis, if you need it, out of a 1989 PCED
You realize that those early 4.9's had the same fuel pressure as all the rest (35) and they had injector fans to eliminate vapor lock symptoms when hot, right?
Very next years, they increased the fuel pressure to 45-60, and eliminated the injector fan that hardly ever worked anyway
Yours is a candidate to drive around with a fuel pressure gauge taped to the windshield for a few days while you evaluate what's happening
Does the guy have a star tester to pull codes from your Bronco?
Or the know how to do the paperclip code test trick?
Pretty hard to do the dynamic response for the KOER test without a actual star tester unless you know what you're doing with the paper clip
See if the guy at the shop has one of these or something similar
I used to work in Evanston in the oil patch days
Where are you in WY?
You could borrow my star tester if you ever get down here to UT and left me your nut sack as a deposit
I'll show you how to use it
It would be interesting to see what it has to say
Probably needs at least a new EVP sensor
However,
I hear tell some of those real early ones did not have a self test connector
Check your fender apron for the self test connector
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