Dean_Fuller

After spending a lot of time replacing fuel lines I have noticed the the hard lines are not exactly CLEAN. I am thinking about adding an in line fuel filter under the hood to help with hard line crap from the rear filter to the injectors. Anyone?? I can't see a problem with it and most are clear so you can SEE fuel flow when its there and when its not. I have used them before of old cars I have had in the past.

Randy V

Much better to replace the old lines.

brutus

The old cars of the past used very low fuel pressure..

Dave928S

I agree ... if the lines are rusting they'll continue to shed scale. Putting a filter in the engine bay will give you two more leak points, which will also need to be redone every time you replace a filter.

Roy928tt

Yes I think the issue is, whether the filter you talk of is capable of withstanding the pressure produced by a fuel injection fuel pump? I'm not sure what it is, but I'm thinking over 40 psi. i'm sure someone will chime in with a correct figure.The point is, a cheap plastic inline filter is a fire waiting to happen.

Beyond that, I think it is a reasonable idea.

pjg

The stock filter used under the gas tank is inline and could handle the pressure, finding a good place to mount it under the hood may be a problem.

Lizard928

The plastic filter you refer to is for use with Zero pressure.
Flush the lines and be done.

ThomO

I had the same issue with my car it sat for years. I put an inline filter under the hood after I had to have the injectors cleaned for the second time. I used a metal filter that was rated for fuel injection. It has been over a year with no issues.

I do plan to remove it this spring when I do my spring maintenance.

dr bob

Dean--

As others point out, common see-through filters are typically not rated for FI system pressures. Great for the 3 PSI commonly used in carburetor cars, not so good at 60+ PSI fuel injection systems.

One option to consider is jumpering the FP relay and letting it flow for a while without running the engine. Fuel comes in the front of the engine, passes through the rails and returns to the tank. Nothing is flowing through the injectors with engine off, so the bulk of any crap that might get loose will be swept back to the tank.

Of course there's a risk of entrained dirt falling into the injectors and plugging them when you finally do start the engine. If you have a serious concern about that, you can always connect a length of hose to the supply line under the hood, and route it back to the gas filler. If you have installed a replacement for the flex section at the right fender wall, you can disconnect that piece and connect your return/bypass hose there instead, so all fuel that's coming through the pump and factory filter is returned to the tank without flowing through the injector rails. This will be the fastest possible flow through the lines to the engine, and therefore the best chance of sweeping crud out of the line and into the tank.

Usual warnings apply-- outside away from the house, charged garden hose ready, a way to stop the fuel pump remotely (switch in the relay jumper), big fire extinguisher ready, and a second body ready to call 911 if there is a fire.

MarkRobinson

I tried to run the stock steel fuel lines on my race car: an '82 chassis that sat in a barn for 8 years. Once running, had problems, had to investigate: found a full fuel filter (of rust particles) + all 8 injectors were backed up with rust particles overflowing out of the inlets. No choice: had to replace new 044 pump, all steel fuel lines, filter, re-balance injectors, etc. Went with a new 044, -8an to the rails, -6 return, all SS braided + an Aeromotive regulator under the coolant expansion tank.