I have a 1990 Ford e250 w4.9L. The front fuel tank gets vapor lock (vacume in tank because tank is not venting as fuel is removed) Started when the rear tank forced fuel from the return line

25

Asked by BadMoon Jul 16, 2014 at 12:12 PM

Question type: Maintenance & Repair

1990 ford e250 with front/rear tank.  Tank switching valve malfunctioned ( has been replaced ) and sent returned fuel from the rear tank into a full front tank forcing fuel out somewhere at the top of the front tank.  Now when using the front tank it has vapor lock (creates a vacume because no venting takes place as fuel is removed).  Where is the venting done on the tank when fuel is removed; at the vapor canister?  The tank works ok if the gas cap is off.  Any ideas?  dfcmike@iserv.net

2 Answers
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BadMoon answered 9 years ago

Your answer was helpful and the problem is the front tank. I believe the vent valve may have been damaged by the rear tank forcing the return line fuel into a full front tank which forced the excess gas out through the vent valve and probably destroyed it in the process. Could you please e-mail me a drawning of the location of this vent valve, mabe a name or part number from ford and the best way to replace it, if I can get one. Thanks Mike

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Fuke answered 5 years ago

Hello, I suppose to have the same problem, BUT just one thing is different, You said previously "as it happends only on front ..." For me is on the both . Does it make a diference ? Thank you by advance.

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