LUVTruck.com

so i just got a 1978 chevy luv that sat in a field for 5 years for $100. everything is working on it except the fuel pump and i dont have any spark. ive replaced the coil so far and still the same, next im going too try the wires. any other ideas what it could be?

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I'm workin' on it
78 chassis with 75 cab
SBC

anyone??

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

have you checked the distributor? sitting that long the points are probably pretty dirty or corroded. mine used to give me issues often

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Luvless
1980 Mikado-Sold.

1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride

X2. Points fried or adjusted improperly.

the distributer seams "ok" but i am not getting any spark at the end of the coil wire either. ive replaced the coil and so far nothing. gonna do the wires and if that doesnt work would it be the wiring too the coil?

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

Don't jump all over guessing and replaceing parts. Clean the points with a point file and check the gap when open while stopped on the lobe highest spot-- .018 thousands gap. Or just replace them. Have someone help you if you don't know how to do this properly. Points have to work first to get spark anywhere.

well ill be changing the coil wire and today i cleaned the points, i got 1 spark at the end of the coil wire after turning it over multiple tries.

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

Make sure you have power to the coil, in fact I would jump power from the battery to the coil, replace the points and I am sure it will have spark.

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Certified pilots, looking down on people since 1903.

ill try and jump it, hopefully that will work . if not i'll do the points

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

My reasoning is that the bypass relay could be bad.

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Certified pilots, looking down on people since 1903.

ok well i jumped it from the battery to coil, and it just kept turning over with no spark. touched the coil and it was HOT so i knew i has some crossed wires. fixed that issue, put on a new coil wire and i now have spark and got it too run for a couple seconds. now i need too figure out my fuel pump issue. is there a relay for the fuel pump that might be dead? and are they inline or in the tank?

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

the relay should be inside the little square box on the passenger side inner fender.
wouldnt hurt to replace the 2 that are in there, the fuel pump is in-line, driver side, under the bed on top of the frame. i had to replace mine 4 times because my relay was shot, worth the few bucks to replace both relays and have that ruled out of any future problems you may run into

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Luvless
1980 Mikado-Sold.

1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride

cant seem to find the relays. only little box is on the driver fender with the 5 or so glass fuses. and thanks so much for the info on the fuel pump!

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

"little box" may be a bad description in the pic it is the box right above my air cleaner up against the fender well, rearward of the coil.. im pretty sure your 78 and my 80 are the same wiring-wise. you can see the small holes from the screws that hold the relays on from the inside
if you need any info feel free to pm me and i will help out where i can.

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Luvless
1980 Mikado-Sold.

1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride

thanks for the info! is there a way too change the wiring to go onto a standard 5 pin relay?

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

got her fired up today! still not sure about the relays, i used another fuel pump hooked to a gas can. the carb is leaking like crazy anyone know of a place for rebuild kits?

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

you have the original carb still im guessing? im not sure who has the kits but i know they are out there a few people have had theirs rebuilt. its a hitachi dch340 or dcp340 check the numbers on it. the stock carbs are pretty crappy to begin with tho. depending on how much it is goign to cost you to get it rebuilt you may want to look into getting a weber. they will go on the stock intake with an adapter from redline weber. they sell a full conversion kit as well.

did you find the relay box? i left my stock relays where they were, (wasnt sure which was which) and wired in 2 new ones next to them one running the fuel pump (all new wiring) and one running my stereo and a few small things like that.

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Luvless
1980 Mikado-Sold.

1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride

sorry for the late reply been playin in the snow with the trucks!. yep found the relays but they are weird. one is a 4 pin all in a row and the other is like a 5 in a row. and i still have the original carb, and dont have the funds to get a weber. ive rebuilt a couple carbs so it shouldnt be a problem, just wondering if there are rebuild kits out there. thanks for all th info again!

_________________
I'm workin' on it
78 chassis with 75 cab
SBC

i installed newer bosch style 5 pin relays so i wouldnt have to put a bunch of wire on the 1 output of a 4 pin. will eventually tear everything out and re wire all of my engine bay. lots of mickeymoused wiring there and under the hood.
and i feel ya im about to head up to larch mountain to get my luv stuck in the snow

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Luvless
1980 Mikado-Sold.

1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride

ok well thanks for all the info! im thinking i'll just rewire the fuel pump since i cant find those relays anywhere. and i wish my jeep could get stuck in the snow! ive never been able to get it stuck, especially now that its locked front and rear

_________________
I'm workin' on it
78 chassis with 75 cab
SBC