I recently bought a 94 Cobra and since I have had the car its had a fuel issue. When this first happened I thought I was out of gas. When the car gets around 150 miles on a tank it starts to act as though its running out of gas. Both times its done this I was at the pump with as much as 1/4 to E showing on the gauge but the car would stutter and stall and not stay running as though it was out of gas (as soon as I filled up it runs fine) Both times this has happened Its taken 7.5 gallons and 11.4 gallons of fuel so I know the tank cannot be empty especially with going 150-160 miles since full. Could this be a bad fuel pump or maybe something else going on with it?
Bad fuel pump?
- Thread starter Venom351R
- Start date
It does sound pump related, though I cannot think of another time I've encountered such an issue exactly.
I also wonder if there's a broken baffle in the tank, causing a semi-cavitation issue.
The pump simply might be overheating (especially if you can start off the day with a low-tank level but then once the pump warms up, it goes south).
Given your nice new ride, if funds allowed, I'd want to get a fresh pump in there just so you know for sure what you have. With all the knock-offs out there, there's always a chance that even a newer pump isn't going to last long. That'd be the time to check baffles too.
Not much help but let's bump ya back up to the top atleast.
Good luck.
I also wonder if there's a broken baffle in the tank, causing a semi-cavitation issue.
The pump simply might be overheating (especially if you can start off the day with a low-tank level but then once the pump warms up, it goes south).
Given your nice new ride, if funds allowed, I'd want to get a fresh pump in there just so you know for sure what you have. With all the knock-offs out there, there's always a chance that even a newer pump isn't going to last long. That'd be the time to check baffles too.
Not much help but let's bump ya back up to the top atleast.
Good luck.
I talked with the previous owner and the current pump is a Walbro 255lph and it has about 15,000 miles on it so now Im starting to think its something other then the pump. Could it be fuel filter related? From what he said before the car was sold to me it had sat for awhile and not been driven much at all. He put a few hundred miles on it right before I bought it but it may have not been a low enough fuel level for this problem to accour when he still had it towards the end.
mo_dingo
20+ Year Stangneter 
It definitely has something to do with the fuel pump. It may be the pickup, but you won't know until you drop the tank. Run the mustang until you run out of gas, drop the tank and see what's going on.
Scott
Scott
stprorolla49
Active Member
Im sorry to hijack the thread but ive been having a similar problem. Is it indeed possible that the pump can overheat? On my trip from NJ to Georgia, I would start driving in the morning and it would go about 200-300 miles (getting gas in between at some point), but then after a certain amount of constant driving at 80mph, the car would just cut out. So after i frustrated myself every day on the 3 days it took to get down here, i would stop at a motel, go to sleep, and the next morning it would run great...for about 200-300 miles til it would die again. FWIW, ive been driving it around here at school in Savannah for 2 months and i have not had the problem once yet. I have not driven more than 50 miles at one time since ive been down here. I have yet to install the walbro 255lph i just bought, do you think this is the problem?
To the original poster, take this for what its worth i guess, but based on whats happened to me, and what JT says its definately a possibility. Good luck with the fix and let us know what happens.
Michael, it definitely can overheat. The fuel running through the pump cools it, and the returning (unused) fuel also has a cooling effect. That's why it sucks so bad to run out of fuel (no cooling and all the sediment getting run through the pump's internals).
One way they test pumps is by making them run dry. They will also have operating temp ranges. Most are good to around something like 155*F if they are healthy, IIRC.
One way they test pumps is by making them run dry. They will also have operating temp ranges. Most are good to around something like 155*F if they are healthy, IIRC.
stprorolla49
Active Member
Well i didnt have a problem with running out of gas, i always had plenty of gas in the tank, it was just an overworking issue i guess? Is this still possible?
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