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Mechanical Fuel Pump

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hubcityford

Mechanical Fuel Pump

Replacing mechanical fuel pump on 81. It has two gaskets included. Do you use both gaskets? Can’t tell difference between the two. Also would you use sealer with gasket(s)?

Thanks
Jeremy

Jeremy “Hubcityford“
1981 4.2L (255) V8 Auto

Gary Lewis

Re: Mechanical Fuel Pump

Administrator

I wouldn't use two gaskets. I think they were just being kind giving you two. But I would use sealer. I use a THIN skim of RTV on both sides.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

kramttocs

Re: Mechanical Fuel Pump

Administrator

In reply to this post by hubcityford

I replaced the one on my 80 400 a month ago and it came with 2 also. Figured it was a mistake so just tossed the extra. On the gasket I used something someone recommend awhile back - 'tacky' something but rtv would work just as well.

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio

Rembrant

Re: Mechanical Fuel Pump

In reply to this post by Gary Lewis

Gary Lewis wrote

I wouldn't use two gaskets. I think they were just being kind giving you two. But I would use sealer. I use a THIN skim of RTV on both sides.

Yup. I put a thin layer of RTV on mine as well, enough that when the pump was tightened in place it just barely squishes out around the edges.

1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995

myrl883

Re: Mechanical Fuel Pump

I'm not a fan of silicone AND a gasket - it's one or the other. On gaskets, I use one of the tacky sealers (Hi Tack, Gaskacinch, etc) both to hold the gasket in place, and as extra insurance.
But to answer your question, one gasket...

Ford Parts Monkey since 1985
1981 F100 Flareside - Black, 302-4V Roller/AOD
1986 F150 Flareside - Medium Fire Red 302/AOD
1989 F150 Standard Cab 4x4 - Dk Shadow Blue 302/AOD
1993 F350 4x4 Crew Cab - 7.3 IDI/ZF-5
I think it's a sickness...

kramttocs

Re: Mechanical Fuel Pump

Administrator

High Tack. That's it. Just something to hold it in place while you finagle it up there.

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio