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Old 02-25-2015, 11:26 PM   #1
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1998 National Tropi-Cal Fuel Issue

Hi there folks,

I'm trying to help my father out remotely, as he's 4000 miles away and not in the best health.

Here's a little background, the motorhome is a 1998 National Tropi-Cal with ford 460 fuel injected.

It sat for roughly 8 months and when he went to start it it would turn over but not start. here's whats been done and what we've found

Checked for spark at coil good spark, check for spark at plugs, it seemed a bit weak so he replaced distributor cap and rotor. as well as coil.

No difference.

Checked inertia switch it is in proper position.

Fuel pump could not be heard when ignition was turned to on.
Tank was dropped and pump replaced as well as inline filter.

Now fuel pump can be heard running for about 3 seconds when key is turned, but no pressure at schrader valve on fuel rail no fuel no air or anything.

Here's my questions, first off what dictates the run time of the fuel pump?
Is there a pressure sensor that could be messed up.
is there a hidden inline booster pump that he may not have noticed on these models.
Any thoughts of what the issue could be.
The engine will fire with starter fluid into the intake. it just doesnt seem to be getting fuel.

Is there an easy way I can tell him to bypass fuel pump control and run it manually?.

Thanks in advance
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Old 02-25-2015, 11:56 PM   #2
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If it is a 7.5L 460 V8 engine it is probably a 1997 chassis. With the schrader valve pin depressed open, try cycling the fuel pump a few times by turning the key on for three seconds until the pump stops and turn the key off and back on a few times to push fuel up through the depressed pin on the schrader valve.

The computer stops the fuel pump if the engine isn't running when the ignition switch is released from start to the on position.
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Old 02-26-2015, 12:45 AM   #3
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Tried

I had him try this already, probably 25 cycles. no luck.
Thanks for the suggestion
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Old 02-26-2015, 06:27 AM   #4
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You did not say if this is an "E" series or a F53 Ford so I will guess it is a 1997 F53.
The PCM Computer has a one second timer for the fuel system. There is no fuel pressure sensor or inline fuel pump.
When the key is turned to the run position the Computer will ground the fuel pump relay for one second and then let the fuel pump relay open to shut off the fuel pump.
But if the engine is cranking or running the PCM Computer will get a PIP from the distributor and each time it sees a PIP pulse it will run the fuel pumps for another second. The PIP pulse will come faster than one second while cranking or if the engine is running. So the fuel pump will run all the time the engine is cranking or running.

To bypass the computer and run the fuel pump all the time the key is on you would ground pin #6 of the self-test plug or short it to pin #2 of the self-test plug.

I just ran into the same problem a few days ago as you have and the installer reversed the power wires to the pump and the pump was running backwards. On his the stock ground wire to the pump was a orange wire and he took it as the power wire and the brown power wire looked black so he thought it was the ground wire.
Note the above wire colors are not the wire colors on the 1997 F53.

The self-test plugs location:




Note that most of the information above does not apply if it is built on an E-series chassis.
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Old 02-26-2015, 03:43 PM   #5
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Subford,
It is an F53. Not the OP, just responding for him.
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