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11 7th July 23:12
the webbers hilltop cycle atv
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Default 1986 Ford F150 problem HELP


Went out and drove it today . I have some more info. , if you "get on it"
from a stop, it runs fine until up to about 2500-3000 rpms and then it
starts bogging down . Then when you let off of it and let it run at idle for
a little while and get back into it. It will do the same thing , I am
thinking more and more that it is starving for fuel .
Now, the high pressure fuel pump is on the frame , but which is it ? The one
with all the hoses running out of it or the one right beside the fuel filter
and only one inlet and one outlet ?
Thanks,
Raz
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12 7th July 23:12
tom adkins
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Default 1986 Ford F150 problem HELP


One inlet,one outlet. The other "thing" is the tank switching valve. I thought you
said you replaced the high pressure pump? GET A FUEL PRESSURE GAUGE and stop guessing!!
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13 8th July 06:16
the webbers hilltop cycle atv
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Default 1986 Ford F150 problem HELP


No, I haven't replaced the high pressure fuel pump.
If you were a bettin man (maybe you are :-) ) , would you lay $ on the high
pressure fuel pump being bad ?
Thanks,
Raz
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14 8th July 06:16
tom adkins
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Default 1986 Ford F150 problem HELP


Absolutely, since it's your money that I'm betting. At this point, you don't even
know for sure if it's a fuel problem.
Here's a quick check:
-Lay under the truck with your hand on the pump.
- Have someone turn the key from Off to On (don't start it).
- You should hear and feel the pump run for about 3 seconds to pressurize the fuel
system.
- If it runs, it's about a 50% chance that it's bad and producing low/no pressure.
Also 50% that it's good and the problem is somewhere else.

Raz, buddy, dude, I don't know any other way to say it without buying headline space
in your local newspaper- BEG, BORROW, or STEAL A FUEL PRESSURE GAUGE!! You can rent
one from almost any chain auto parts store for a net cost of $0 after you return it.
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15 8th July 06:18
happy traveler
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Default 1986 Ford F150 problem HELP


Tom,
Some people (my kids being a prime example) just HAVE to learn from their
own experience. Why not let him do that?
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16 8th July 16:02
the webbers hilltop cycle atv
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Default 1986 Ford F150 problem HELP


Tom,
I made a fuel pressure gauge and taped it to the winsheild like you said. I
am running 30lbs at idle and when I romp on it, it runs up to 40 lbs. I
drove a full tank of gas out of this pickup and it didn't even mess up once
! UNTIL , I switched tanks ! I have a sticky dash switch or the actual valve
that switches the tanks. When the tank ran out, I saw the fuel pressure take
a dive down to 0-5 lbs and then my problem occured. I had to flip the switch
4 or 5 times before I saw the fuel pressure come back up and now it is still
running fine.
I don't know whether to replace the valve or just run on one tank all the
time.
Thanks so much for your help .
Raz
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17 8th July 16:02
tom adkins
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Default 1986 Ford F150 problem HELP


AAHAAA!!! The tank switching valve is bad.(I don't think I've EVER seen a dash switch
fail. It could though.) Those things can cause all sorts of goofy problems. You
really could get lucky with a used one, they don't really fail often, but when they
do... The best course is, obviously, a new switching valve.
If you can live with one tank, you should bypass it completely.
See how easy that was with the gauge? You could see the problem happen before your
eyes. The 30 at idle and 40 under load is perfect. Keep that tool in your arsenal and
there will never be a fuel pressure question again.

Glad you found the problem Raz, Best of luck to you.
Tom Adkins.
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18 8th July 16:02
tom adkins
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Default 1986 Ford F150 problem HELP


Hey Raz,
You said you "made" a fuel pressure gauge. I'm really curious, how did you do that?
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19 8th July 16:03
bruce l. bergman
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Default 1986 Ford F150 problem HELP


I'm not Raz, but even I know the answer: The only tricky part is
getting the male test port for the fuel rail test fitting.

The rest is a simple exercise in plumbing and mechanical assembly
that can be done a bazillion different ways depending on the materials
you have at hand. Myself, I'd go for high pressure rubber fuel line
(as small as possible) and a mechanical bourdon gauge - one with a
diaphragm isolator would be a bonus, so the bourdon tube cracking
can't make a big fuel leak.

Electric gauges are way too slow to catch transients, like you would
get with air bubbles or a pump that momentarily seizes or loses prime,
or the power supply is intermittent...
--<< Bruce >>--
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20 8th July 18:35
the webbers hilltop cycle atv
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Default 1986 Ford F150 problem HELP


Tom,
I am a journeyman tool and diemaker by trade and forklift mechanic . I work
in an automotive stamping facility and has access to all types of gauges,
hoses and fittings .
We have our own hose fitting machine so making a high pressure hose was not
a problem .
Then I just took the valve core out of the schrader valve and found a
fitting that would thread on.
Just the profession I am in and now I have another tool that can be used
elsewhere.
Raz
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