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Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Hi everybody, I need to change my fuel filter and found it no problem in the stock location. However, less than a foot up the line appears to be a second filter... Is this normal or something the previous owner may have done when he switched to a carb setup? Here's a pic of the line showing where the two are connected quite close together:
And a better pic of the 2nd "filter?":
Last edited by camaro42; 05-28-2016 at 12:12 PM.
Reason: Add pic
Thanks! The odd thing is, the mechanic who put my 400 in also added a fuel pump in the engine bay... I don't see any wires on this old inline one under the car. Any ideas to figure out if it is still "active"? Would it tick when the key is turned if it were hooked up? Thanks in advance for any thoughts/opinions.
Yes it would be noticeable when it turned on. A bit louder than the intank pumps especially with where it is mounted.
That pump looks like it died 20 years ago.
Yes it would be noticeable when it turned on. A bit louder than the intank pumps especially with where it is mounted.
That pump looks like it died 20 years ago.
Haha. Yes, it does... I am pricing lines and fittings to replace the whole section of line, filter, and pump. There is a new pump in the engine bay so I should be able to just delete this old rusted and dead one... I think.
At one time, someone probably mounted that pump to act as a "pusher". Most of the usual aftermarket electric fuel pumps won't pull fuel uphill very well, so they say to install the pump at or below the level of the tank so it'll at least partially be fed by gravity. An electric pump alone mounted in the engine compartment will sometimes work "OK".
When I bought my Mustang it had one of the cheesy cube shaped Purolator fuel pumps mounted to the inner fender because they'd put a later model 2.3 without a mechanical pump provision in the car. It would start and run, but if you pulled away from a stop hard into the gas, the 1bbl carb would empty it's fuel bowl before the pump could catch up. It felt like hitting a brick wall, and of course the engine would stall. Moving the pump back to the frame rail 12" from the tank cured the stalling and fuel starvation. Funny how reading the instructions works sometimes.
It's entirely possible that there's still an OEM electric pump in the fuel tank, and the old aftermarket pump inline, in addition to whatever is in the engine compartment. It sucks, but if it were my problem, I'd probably pull the tank and check the sending unit. I'd run a low pressure pusher pump either in the tank or near the tank to prevent a fuel starvation issue, but that's just me.
At one time, someone probably mounted that pump to act as a "pusher". Most of the usual aftermarket electric fuel pumps won't pull fuel uphill very well, so they say to install the pump at or below the level of the tank so it'll at least partially be fed by gravity. An electric pump alone mounted in the engine compartment will sometimes work "OK".
When I bought my Mustang it had one of the cheesy cube shaped Purolator fuel pumps mounted to the inner fender because they'd put a later model 2.3 without a mechanical pump provision in the car. It would start and run, but if you pulled away from a stop hard into the gas, the 1bbl carb would empty it's fuel bowl before the pump could catch up. It felt like hitting a brick wall, and of course the engine would stall. Moving the pump back to the frame rail 12" from the tank cured the stalling and fuel starvation. Funny how reading the instructions works sometimes.
It's entirely possible that there's still an OEM electric pump in the fuel tank, and the old aftermarket pump inline, in addition to whatever is in the engine compartment. It sucks, but if it were my problem, I'd probably pull the tank and check the sending unit. I'd run a low pressure pusher pump either in the tank or near the tank to prevent a fuel starvation issue, but that's just me.
The old pump doesn't appear to be "live" right now so I think the fuel is only being pulled by the engine compartment mounted pump. Once I get the carb rebuilt, I will get rid of the old pump and remount the new one down on the frame-rail so that it is not pulling all the way to the front of the car. Should the pump be in line between tank and filter or after the filter? Thanks for the input! 👍🏻
Last edited by camaro42; 05-29-2016 at 04:30 PM.
Reason: Additional question...
05-28-2016, 12:10 PM
with where it is mounted.
