1998 E350 fuel pressure question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 27 (permalink) Old 01-27-2007, 05:57 PM Thread Starter
 
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1998 E350 fuel pressure question

this site helped me diagnose and repair last night, so i thought i'd try again with my van.

it is a '98 E350 7.3L PSD, truck has sat for over two weeks, has always had hard start problem, excessive cranking time, but now it doesn't start at all, i have had to replace the starter twice for burning it up.

so now i'm ready to diagnose. it cranks good and strong, i want to perform a fuel pressure test, where is the pressure test port located?
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post #2 of 27 (permalink) Old 01-27-2007, 06:04 PM
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one of 2 choices if its the old fuel system with the mechanical pump there should be a schrader valve on the filter head to hook to .. if its the new system with electric pump there is a 1/8 pipe plug in rear of drivers side head square drive socket need to remove you can tap in there for fuel pressure.. actually with either system that port can be used if it has nothing hooked to it

should have 45-65 psi there

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post #3 of 27 (permalink) Old 01-27-2007, 06:14 PM
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Quote:
it is a '98 E350 7.3L PSD, truck has sat for over two weeks, has always had hard start problem, excessive cranking time, but now it doesn't start at all, i have had to replace the starter twice for burning it up.
That has bad Glow Plug Relay written ALL over it. Without functioning GPs, the 7.3L PSD will be a hard start even at 60*F or above. No/low fuel pressure causes the same symptoms as no GPs, except low fuel pressure will also reduce power, where if the GPs do not work power is unaffected.

You also need battery voltage at the Injection Pressure Regulator valve (IPR) with the key ON and the valve plugged into the harness. No power, no start.

I wrote up a hard/no start diagnostic procedure in the tech files section for Ford.

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post #4 of 27 (permalink) Old 01-27-2007, 06:33 PM Thread Starter
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hey john, where are the tech files located, i wanted to check it out.

i did replace the gpr and gp's about six months ago, but never did any testing.
may as well start now.
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post #5 of 27 (permalink) Old 01-27-2007, 06:58 PM Thread Starter
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ok, fuel pressure tested while cranking, i found 60 psi.
still can't locate tech files for ford. want to test gpr.
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post #6 of 27 (permalink) Old 01-27-2007, 07:23 PM Thread Starter
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ok, i found some info on gpr, at post #2 battery feed, i found 12.38v Key off,
with keyon engoff at post #10 i get 11.08v

this to me seems good, i want to check oil pressure, i think it is the problem, not sure where to test and if i will need a special tester.

i have regular gas engine oil pressure test equipment.
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post #7 of 27 (permalink) Old 01-27-2007, 07:35 PM
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The HEUI (injection control system) uses 600 PSI to 4500 PSI of oil pressure, DO NOT use a gauge!

The easiest thing to do is use a scan tool to monitor "ICP" while cranking the engine over. It will not start with less than about 650 PSI. If it has 300-500 PSI, you DO NOT have a bad HPOP (High Pressure Oil Pump), but may have a bad IPR valve.

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post #8 of 27 (permalink) Old 01-27-2007, 08:37 PM Thread Starter
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hey john, i got ahold of a better scanner, performed a continuous memory test to find p1391, 1393, and 1670.

Glow plug related, you are good!

i did check for key on voltage and battery feed.

how do i test for output from relay to each bank?
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post #9 of 27 (permalink) Old 01-27-2007, 08:42 PM
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Quote:
Originally Posted by jots512
hey john, where are the tech files located, i wanted to check it out.

i did replace the gpr and gp's about six months ago, but never did any testing.
may as well start now.
Here's the specific one John is talking about.

hard start


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post #10 of 27 (permalink) Old 01-27-2007, 08:43 PM Thread Starter
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icp found while cranking is reading over 4000, i suppose this is good, i'm gonna keep on with glow plug circuit.
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