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Topic Review (Newest First)
07-16-2010 08:47 AM
jmichaelre there is no restriction like that on smallest port of the fuel pump
07-15-2010 03:27 PM
cobalt327 Back on the 5th, there was a THREAD asking about the restriction shown here:



There was no real resolution to the question. It would seem, however, that the size of the restriction on this pump could have an effect on the pressure supplied to the carb.
07-15-2010 02:51 PM
jmichaelre I don't remember seeing any type of restriction in the outlet barb if that what you mean. I had to buy a fitting for it when I was at the store cause I didn't have the original pump.

I'm guessing you think the fitting might be causing the high pressure?
07-15-2010 02:47 PM
cobalt327
Quote:
Originally Posted by lmsport
the pumps with the small connection were intended for circulating fuel back to the tank to help with vapor lock. I think. Some cars had the fitting on the fuel filter.
Thanks for the correction.

BTW, was this the type w/a small sized brass-looking restriction visible inside the barb?
07-15-2010 02:40 PM
jmichaelre
Quote:
Originally Posted by lmsport
the pumps with the small connection were intended for circulating fuel back to the tank to help with vapor lock. I think. Some cars had the fitting on the fuel filter.

that sounds like a return to me
07-15-2010 02:20 PM
lmsport the pumps with the small connection were intended for circulating fuel back to the tank to help with vapor lock. I think. Some cars had the fitting on the fuel filter.
07-15-2010 02:12 PM
jmichaelre I have my return line hooked to that smallest port on the fuel pump. Its where it was hooked up on the old engine.
07-15-2010 02:02 PM
cobalt327
Quote:
Originally Posted by jmichaelre
The pump has a return so it won't be deadheaded right?
I believe that 'extra' hose barb on the pump is a vapor line to the tank or charcoal canister. Someone correct me if this is wrong.
07-15-2010 01:58 PM
jmichaelre Bought this pump at Oreilley Auto Parts told them it was for an 86 Silverado 4x4 with a 350. I paid 34.99 for it....here's the link

Fuel Pump link

The pump has a return so it won't be deadheaded right?
07-15-2010 01:34 PM
techinspector1
Quote:
Originally Posted by jmichaelre
Should I throw on a regulator and see if it fixes everything?
A regulator will likely bring the pressure into line, although it is not the ideal fix because fuel is dead-headed against it, heating the fuel and working the pump harder. If I were going to do this, I would want to use a bypass regulator and return line to the tank to bleed off excess pressure.

Alternately, you could install a stock pump. What is on the motor now is NOT a stock pump. Here's an example of what I might install....delivers 5 1/2 to 6 1/2 pounds pressure, no regulator needed....The Holley carb needle and seat can handle 6 1/2, whereas an Edelbrock or Carter AFB could not.
http://www.summitracing.com/parts/CRT-M6624/
07-15-2010 12:20 PM
jmichaelre got me puzzled too.....one thing to note is that the filter is always full when its running....
07-15-2010 12:13 PM
cobalt327
Quote:
Originally Posted by jmichaelre
Should I throw on a regulator and see if it fixes everything?
My only concern w/this, is the fuel pump is draining the fuel from the line and filter quickly- and I just don't think it should. Combined w/the too high pressure (provided the gage is accurate) makes me think the pump's faulty.
07-15-2010 12:11 PM
jmichaelre Should I throw on a regulator and see if it fixes everything?
07-15-2010 12:08 PM
cobalt327
Quote:
Originally Posted by jmichaelre
Went home over lunch and hooked up the gauge, but never took it for a drive. With the truck idling I was getting between 9 and 10 psi which is crazy high I pinched off the line a little between the filter and the carb and got it down to 7, 6, and then 5.

Is this reading possible with a stoch mech fuel pump. I do have to mention that all of my drivability problems have been in drive the worst in 3rd gear.

If I drop it into first or 2nd I dont have any problems. Is it possible that this reading is right and that my needle isn't being able to withstand the pressure?
In first or second, the RPM is higher, that usually means more fuel is being used, so it is possible for the carb's needle and seat to be more overwhelmed in high gear than in the lower gears.

But if the gage is accurate, that is likely the problem- TI for the win! lol
07-15-2010 11:45 AM
jmichaelre Went home over lunch and hooked up the gauge, but never took it for a drive. With the truck idling I was getting between 9 and 10 psi which is crazy high I pinched off the line a little between the filter and the carb and got it down to 7, 6, and then 5.

Is this reading possible with a stoch mech fuel pump. I do have to mention that all of my drivability problems have been in drive the worst in 3rd gear.

If I drop it into first or 2nd I dont have any problems. Is it possible that this reading is right and that my needle isn't being able to withstand the pressure?
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