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Diesel injection pump pressure test ?
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CarGuru > Technology > Diesel injection pump pressure test ? 31 January 2005 13:32:54
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Diesel injection pump pressure test ?

Rkpatt758@My-Deja.Com 31 January 2005 13:32:54
 I am would like to find out the approximate pressure of my Ford 7.3 IDI
F250 injection pump . I suspect in is going bad but I want to confirm
it before replacing it . Can I get a 0-3000 psi guage and plumb it up
( with the pessure appropriate fittings and metal line ) to one of the
the injector pump ports and crank it for a couple of seconds ( cold, no
glow plugs ) or would I be better off installing it in a Tee and
connect the injector ( basically running it parallel) . As I presume
that it takes about 1800 psi to run the injector , the pump should be
running a minimum 2,000 psi hot or cold . =thanks

Add comment
Jack Hayes 30 January 2005 04:17:23 [ permanent link ]
 
<rkpatt758@my-deja.­com> wrote in message
news:1107043589.361­488.154030@z14g2000c­wz.googlegroups.com.­..> I am would like to find out the approximate pressure of my Ford 7.3 IDI> F250 injection pump . I suspect in is going bad but I want to confirm> it before replacing it . Can I get a 0-3000 psi guage and plumb it up> ( with the pessure appropriate fittings and metal line ) to one of the> the injector pump ports and crank it for a couple of seconds ( cold, no> glow plugs ) or would I be better off installing it in a Tee and> connect the injector ( basically running it parallel) . As I presume> that it takes about 1800 psi to run the injector , the pump should be> running a minimum 2,000 psi hot or cold . =thanks>

For a good test you need the injector out of the engine, this enables you to
determine if the spray pattern is OK or if any dripping is occurring. This
test is normally done with a hand operated pump.

Jack


Add comment
Rkpatt758@My-Deja.Com 30 January 2005 16:31:47 [ permanent link ]
 I want to test the pump pressure itself ( at least get a good idea as
to whether it is going bad ) not the injectors .

Add comment
Pater 31 January 2005 03:10:23 [ permanent link ]
 If you have a way in, a guage that reads the pressures desired & the
specs your already there. Most of the 7.3s I see have an extension of
some sort on top of one of the injectors (usually right front) that
screws onto the top of the injector, then the line screws onto that. If
you had one of these (from a junkyard) you could tap threads into the
side of it to accomodate your guage & it would be a bolt in/ removable
situation so you wouldn't have to destroy anything in the fuel system
to tap in.

Add comment
Ralf Ballis 31 January 2005 03:40:30 [ permanent link ]
 The best way is to remove the pump and attach it to a test arrange to check
for all of fuel delivery aspects.

Regards,

Ralf
--
www.omnibusclub.de
Add comment
Colin French 31 January 2005 13:32:54 [ permanent link ]
 I have workred in a fuel pump shop for 15 years
diesel pumps realy work on volume of fuel
depends on load and speed ,if your motor starts and runs / idle smooth
the pump is in pretty good mechanical condition
if it is hard to start hot or cold and the motor is in good condition
,compression , timing etc
the pump elements are worn out through dirty fuel
a simple test to check pump elements
remove an injector from motor and turn it up side down
replace it back on the injector pipe (dont worry about the return pipe let
it flow to the floor /container )
crank the motor over and watch the spray patten (in the run position )
KEEP HANDS AND BODY AWAY FROM DIESEL SPRAY ,
DIESEL IN YOUR BLOOD STREAM YOU DIE QUICKLY
the spray should be an atomise spray ( not like an oil can)
to check for a miss undo one injector pipe at a time if you find a miss swap
the injector to an other cylinder
and see if the miss follows the injector
the best thing to do is remove the pump and have it tested on a test bench
and reset to the test data
<rkpatt758@my-deja.­com> wrote in message
news:1107088307.212­229.204520@c13g2000c­wb.googlegroups.com.­..>I want to test the pump pressure itself ( at least get a good idea as> to whether it is going bad ) not the injectors .>


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CarGuru > Technology > Diesel injection pump pressure test ? 31 January 2005 13:32:54
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