truck is a 1996 ford f250 460 7.5

well my truck wont start on petrol cant hear any noise from fuel pump ?

tryed switch to the rear tank and still nothing

had a quick look at fuses ect everything ok

any really common problems on these ?

its also on lpg but cant see that being a problem as its runing fine on it

 

Perhaps the fuel pump relay has been removed?

 

a have just checked the relay swapped it with the horn one same part number no luck

also checked fuel switch off all seems ok

a have had it runing off petrol allways heat it up for 10 mins on it then switch to lpg

 

Some fuel system schematics to get you closer:

This shows the relationship of the EEC Relay and Fuel Pump Relay as well as supply fuse:


courtesy of oldfuelinjection.com

I know it is labeled for a 5.8L equipped truck, but it is the same for your 7.5L truck.



This one is for a 1991 F-series, but again it is very similar to your 1996:

courtesy of oldfuelinjection.com

I hope that helps shed some light how the fuel system is wired. Omitting everything related to the LPG system added to the truck....

 

Does the check engine light turn on when you turn the key on without starting the engine?

 

Yeah my check engine light is on. has been on since a owned but haven't had any issues with truck till now was told that the LPG caused the check engine light to be on

Plus can't find anyone to plug it in as ain't many off these in Scotland

 

If you can not find anyone to plug it in then you could ground the STI wire, get behind the wheel with pin & paper, turn on the key and count the flashes of the MIL in the cluster.
You can post the counts back here and we will tell you what they mean.
For more information on this go to this link:
Fuel Injection Technical Library » How To Run a Self-Test

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The computer is designed to turn the check engine light on anytime it receives power an the engine isn't running. Light on while running indicates a code obviously.

So just seeing if the light is on with the key eliminates the possibility of the computer not getting power.

How do you switch between LPG and Gasoline? I'd assume it's some kind of switch that opens up a solenoid on the LPG tank and disconnects the fuel pumps electrically. I'd suspect something with this switch.

 

That is exactly where I was headed

 

why didnt a think off this ha !!!!!! the lpg is on a switch basically lit it warm up 10 mins switch it off then switch over to lpg and start will get a look at it tomorow

weird one after my engine check light being on since ave owned the truck went out earlier after write n post went down to the garage and the engine check light out mmmmm and been out since bonus

cheers for info guys

thanks

 

But does it turn on with the key on engine off?

 

Yeah engine check /abs/ ect come on till you start it then they go out ?

 

Yup normal.

 

well got down to my fuel problem was front fuel tank pump aint working getting power to it

so after switching to rear tank wee run all good starts spluttering and bogging down so after a wee look round disconected air flow metre rev n up fine so new air flow metre aswell just my luck ha

thanks for all the help guys

 

You have a '96 Mass-Air 460? Is it OBD-1 or OBD-2? (OBD-II would have a test port under the dash somewhere, OBD-1 has connector under hood)