preasure rating for fuel pump

[roadgrime]

anyone know what preasure rating i should look for in a fuel pump?

My mechanical started leaking today (not when it runs only when i shut it off) and im thinking about switching to an electrical.
anyone know of a cheap electrical inline pump?

[Don S]

..

roadgrime;
... I just posted this yesterday so I'll just copy it...

... A fuel pump for a six cylinder engine should put out 4 to 5 psi and a fuel pump for an eight cylinder engine should put out 5 to 6.5 psi. Both six and eight cylinder fuel pumps should pump one pint in 30 seconds at idle RPM. These are ‘specs’ for 1981 Jeeps per AMC.

... I use a heavy duty Gyrator style electric fuel pump (the Holley red-top at over $100) mounted low and close to the fuel tank with a filter between it and the fuel tank. Fuel pressure regulators are not required with this pump.
... Doing away with the mechanical pump will allow you to route the fuel lines to cooler areas. Running larger size fuel lines (3/8th”metal) outside of the frame works very well but it is NOT safe as far as side impacts (crashes) are concerned. Vibrations in the fuel line may be a contributing factor to vapor lock.

... Installing a fuel pump inside the fuel tank is like a two edged sword ! It keeps all of the feed line under pressure but the electric motor adds a lot of heat to the fuel(some gasoline will boil at 187f). Replacement on the trail will be more difficult.
... Gyrator pumps will be damaged if run without fuel to cool and lubricate the steel parts. It is a good idea to bench run a gyrator pump with some light oil for a short break-in.
... In spite of many claims extra fuel pumps in line do create more friction in the fuel lines so that at critical times all must be running at the same time.
... Simply adding an electric pump in line with a mechanical pump is doable but will slightly impede the fuel flow unless the electric-pump is switched on. The electric pump may put a strain on the diaphragm of the mechanical pump. If the diaphragm wears out a hole will develop which could cause a catastrophic amount of fuel to end up in the crankcase quickly.
... It is a good idea to mount a spare electric fuel pump close to the one your are using. Should a pump fail the hoses could be switched quickly.

Good Luck.. http://www.boylover.net/ubb/graemlins/cool_shades.gifand CUL.. Don S..

[roadgrime]

Don great info.
either way I am not driving it till i get the fuel pump fixed. and I will check my oil before i drive it again. I dont think its leaking into the crank case but ratherout side where the two halves join.

I may just stick with a mechanical for the time being since 100+ is a little more than i want to spend this month (wife is on me for spending a few hundered already but hey what do you expect for a 200 dollar jeep)

If anyone else knows of a cheap electric. perhaps one thats stock off another car i am open to suggestions and as a side note mine is an 8 cyl.

[Joe Guilbeau]

You can get some Cater pumps cheap, and don't overlook the bone yards.

[roadgrime]

carter are mechanical?

i know a new mechanical for the jeep is 20-30 not bad but if i could find an electric then i would rather go that route even if i pulled it from the junk yard. just need to know where to look as non of my vehicles have had electric pumps i could use.

[Don S]

..
roadgrime;
... I bought a rotary electric motored, plunger style Carter pump at Napa ‘bout 10 ten years ago for $80.00 and it was pretty good.

... I will never waste my money on solenoid or SCR type pumps again. They are OK for a little while as a part time boost for a mechanical pump but if you have a real vapor lock problem they make great trout line weights. There are a few more ideas in the link below.

link>VAPOR LOCK (http://groups.msn.com/ATexasOklahomaJeepClub/ouraycotopic.msnw)

Good luck and http://www.michiganjeepers.com/forums/images/graemlins/wave.gif and … CUL.. Don S..