ok my fuel pump wouldn't kick on, so I thought it was the pump. So I
replaced the pump and the tank and the fuel filter and put in a new
switch on the dash, but my pump won't kick on. When I had it apart I
made sure that everything was getting power and working properly. I
went out the other day to work on it and I turned the key and the pump
just kicked on and it ran and I tried it later that day and I turned
the key and the pump didn't kick on. I'm at a loss as to what it could
be. I can replace anything, but I mean it sounds like an electrical
issue, but I checked all the wires and double checked everything and it
all looks fine, but it is like the pump will get power and then not get
power. I even spliced into the ground on the pump to make sure it was
working and the ground is fine, because sometimes it will kick on and
run fine and then other times it doesn't I'm at a loss the only thing
that I haven't replaced is the inertia switch and the relay, but the
relays are pretty much all the same and you can mix and match them in
the fuse box and the pump still won't kick on. please any ideas,
because I'm trying not to take it to a garage since I aleady did pretty
much all the hard work.

I have a 6 cyl, manual tranny with 4 gears and overdrive.

you should check the grounds with a meter.
old john


Hello, mitsurugi3644 (AT) hotmail (DOT) com!
You wrote on 28 Oct 2006 08:44:03 -0700:

m> ok my fuel pump wouldn't kick on, so I thought it was the pump. So I
m> replaced the pump and the tank and the fuel filter and put in a new
m> switch on the dash, but my pump won't kick on. When I had it apart I
m> made sure that everything was getting power and working properly. I
m> went out the other day to work on it and I turned the key and the pump
m> just kicked on and it ran and I tried it later that day and I turned
m> the key and the pump didn't kick on. I'm at a loss as to what it could
m> be. I can replace anything, but I mean it sounds like an electrical
m> issue, but I checked all the wires and double checked everything and it
m> all looks fine, but it is like the pump will get power and then not get
m> power. I even spliced into the ground on the pump to make sure it was
m> working and the ground is fine, because sometimes it will kick on and
m> run fine and then other times it doesn't I'm at a loss the only thing
m> that I haven't replaced is the inertia switch and the relay, but the
m> relays are pretty much all the same and you can mix and match them in
m> the fuse box and the pump still won't kick on. please any ideas,
m> because I'm trying not to take it to a garage since I aleady did pretty
m> much all the hard work.

With best regards, ajeeperman (AT) comcast (DOT) net. E-mail: ajeeperman (AT) comcast (DOT) net

I tapped in the ground coming out of the plug that goes into the fuel
tank and ground it against bear metal on the frame and it did nothing.
I also checked and double checked the wires going all the way up in to
the fuse boxes and they all look fine and are in their plastic binder.
it may be a ground issue, but I have 2 tanks and when one tank doesn't
work neither will the other one. and when one works I will switch tanks
and the other one works as well. It may be a ground, but all the wires
looked fine. how do I check the ground more accurately or any other
ideas? I'm stumped

mitsurugi3644 (AT) hotmail (DOT) com wrote:
When it won't start, is there power to the relay? Does the power make it to
the pump? Is the ground good?
What year truck is this, Always important when asking questions


--
Stephen W. Hansen
ASE Certified Master Automobile Technician
ASE Automobile Advanced Engine Performance
ASE Undercar Specialist

http://autorepair.about.com/cs/troub...l_obd_main.htm
http://www.troublecodes.net/technical/
http://www.familycar.com/Alignment.htm

ok how do I check to make sure power is going to the relay. and I'm
pretty sure it is cause it sometimes kicks on, but then again I'm not
sure and thanks for the webpages but I don't have a code machine and my
check engine light isn't even coming on. So I don't think it would
throw out a code if the check engine light isn't coming on, but I'm not
sure. Also if the relay isn't getting power what would stop it from
getting power?

my truck is a 1991 ford f150 with a 6cyl engine and manual tranny with
4 gear and overdrive. and I'm assuming the ground is good cause
sometimes the pump kicks on and it run fine, but then sometimes it
won't kick on at all. I also have to tanks and it only has 2 pumps in
the tank with FDM's, so there is no pump on the frame rail. Here is
another thing when my one pump won't kick on neither does the other
pump, so something isn't letting both of my pumps get power and when
one kicks on then both my pumps work, So I'm at all lose. I replaced
the one fuel pump and filter and it didn't fix it, so I'm assuming it
wasn't the pump to begin with. please any ideas I also replaced the
switch on the dash. any ideas?

OK, Your in the same year range as my dad and mine Fords, just different
motors. Do you have a 12v test light and multimeter?
There are usually 4 slots for the fuel pump relay. two will be hot and two
will be grounds at one time or another. Look at the relay.there may me a
schematic on it; one of the hot and grounds job is to connect the other hot
and ground together. When you cycle the key, the relay should click once for
about 5 seconds, then if the truck doesn't since the engine running it shuts
off.
So with a test light turn the key on and look for power at all 4 pins of the
relay, try to find the two with power, remember , one of those will only
have power for about the first 5 sec of the key turn.

IF you can get to and see the back of the relay connector the power wires
for the fuel pump should be yellow in from battery, dark green yellow out to
fuel pumps and red in for the relay activation and tan/light green out for
its ground.

With the truck off applying 12v to the dk green yellow wire should start the
truck if the relay was bad.


--
Stephen W. Hansen
ASE Certified Master Automobile Technician
ASE Automobile Advanced Engine Performance
ASE Undercar Specialist

http://autorepair.about.com/cs/troub...l_obd_main.htm
http://www.troublecodes.net/technical/
http://www.familycar.com/Alignment.htm


<mitsurugi3644 (AT) hotmail (DOT) com> wrote

ok I went to advance auto parts and to a ford dealer and they gave me
the same exact relay for my truck. I am asking for the specific
location of the fuel pump relay on my truck, because I cannot find it
and it isn't in the fuse box. Both places gave me something that like
clips into something, but I can't find where it would go. Now I did ask
them for the "fuel pump relay". So can someone please tell me where
this device would go cause I would like to replace it, but I don't have
a location on it and I will need the exact location please. I am losing
my mind looking for it.

<mitsurugi3644 (AT) hotmail (DOT) com> wrote

Under hood, driver side, upper engine area, rear of
air filter housing, mounted on wheelwell
Autozone sucks for parts, but the web page is a handy source of
infoWhitelightning